September 2021 will see expansion of TTC service in anticipation of returning demand including in-person learning at schools and universities. Many express bus routes will be improved or enhanced.
In a reversal of past practice, schedule adjustments for “on time performance” will actually reduce rather than add to travel times in recognition that buses do not need so long to get from “A” to “B”, and that they can provide better service running more often on their routes than sitting at terminals.
Full details of the schedule changes are in the spreadsheet linked below.
This article is another in a series reviewing the behaviour of routes where RapidTO “red lanes” exist or are proposed.
Updated August 8, 2021: A reader pointed out that the 929 Dufferin Express existed pre-pandemic, although I did not include any data for it in this article. I was not tracking this route between its debut in October 2018 and February 2020 because historical bus tracking data from the new Vision tracking system were not available until mid-2019. I do have March 2020 data and have added this to the article. It shows very clearly the transition in travel times as demand and road traffic fell during that month.
The 29 and 929 Dufferin services operate between either from the western gate Dufferin Loop or the eastern gate Princes’ Gate Loop to Wilson Station. Except for the stopping pattern, the routes are identical between King and WIlson Station, the portion of the route reviewed here.
The 929 Dufferin Express bus began operation in mid-November 2020 with standard sized buses, but converted to the larger artics in the second week of May 2021 at roughly the same headway thereby increasing route capacity. The 29 Dufferin local service has been operating with articulated buses throughout the period of the data presented here.
Schedules for both the local and express services were adjusted on May 9, 2021, to add more running time for reliability.
This article deals with:
The change in travel times for the local 29 Dufferin Jane service between King and Wilson (the portion of the route proposed for Rapid TO) from pre-pandemic traffic conditions and their evolution through the low point of demand and congestion in 2020 through to June 2021.
The difference between local and express services.
The reliability of service.
The High Points
Although the Dufferin corridor saw a drop in travel times co-incident with the pandemic’s onset, this effect was short-lived and travel times have grown in the past year, in some cases above April 2018 (the reference date for “before” conditions).
(Why April 2018? This was the point where bus tracking started the transition from the old “CIS” monitoring system to the new “Vision” system and historical tracking data for bus routes were not reliably available for an extended period.)
Dufferin has suffered from construction interference at Eglinton on-and-off for several years, although this effect varies. However, that is not the only location where slowdowns occurred. Any review of red lanes needs to consider which locations will provide the greatest benefit, although these tend to be places where resistance to dedicating capacity to transit will be very strong.
There is a consistent difference in travel speeds between local and express services, although for some periods and locations, the pre-pandemic service was faster.
Headways on Dufferin are quite irregular and much of the service is bunched. In late June, travel times rose markedly due to construction, and headway reliability declined even more. This condition probably persisted into July, and the data for that month are still to come.
Reliability issues occur in the off-peak and on weekends, not just during the traditional peak periods.
An important distinction in discussing transit priority lanes will be the degree to which they contribute to service reliability. The King Street transit mall was a very different location from the bus routes where red lanes are proposed. King Street has very frequent transit service and strong transit demand, not to mention pedestrian activity and crowd-generating events year-round. It also has parallel streets to which traffic could shift.
How much benefit can actually be achieved on Dufferin is quite another question. A political challenge lies in the fact that there are problem areas on Dufferin, but not all of the time. Red lanes are a 7×24 change in a street’s configuration and their overall benefit must be strong enough to survive challenges. A good analogy on King Street is the carve-out for taxis that was implemented and contributed to motorists generally ignoring the traffic rules even before 2020.
For regular readers of this site, it will be no surprise that my opinion of the TTC’s reporting on service quality is that it is deeply flawed and bears little relationship to rider experiences. It is impossible to measure service quality, let alone to track management’s delivery of good service, with only rudimentary metrics.
The TTC reports “on time performance” measured only at terminals. This is calculated as departing no more than one minute early and up to five minutes late.
Data are averaged on an all-day, all-month basis by mode. We know, for example, that in February 2020, about 85 per cent of all bus trips left their terminals within that six minute target. That is all trips on all routes at all times of the day.
No information is published on mid-route points where most riders actually board the service.
Management’s attitude is that if service is on time at terminals, the rest of the line will look after itself. This is utter nonsense, but it provides a simplistic metric that is easy to understand, if meaningless.
There are basic problems with this approach including:
The six minute window is wide enough that all vehicles on many routes can run as pairs with wide gaps and still be “on time” because the allowed variation is comparable to or greater than the scheduled frequency.
Vehicles operate at different speeds due to operator skill, moment-to-moment demand and traffic conditions. Inevitably, some vehicles which drop behind or pull ahead making stats based on terminal departures meaningless.
Some drivers wish to reach the end of their trips early to ensure a long break, and will drive as fast as possible to achieve this.
Over recent years, schedules have been padded with extra time to ensure that short turns are rarely required. This creates a problem that if a vehicle were to stay strictly on its scheduled time it would have to dawdle along a route to burn up the excess. Alternately, vehicles accumulate at terminals because they arrive early.
Management might “look good” because the service is performing to “standard” overall, but the statistics mask wide variations in service quality. It is little wonder that rider complaints to not align with management claims.
In the pandemic era, concerns about crowding compound the long-standing issue of having service arrive reliably rather than in packs separated by wide gaps. The TTC rather arrogantly suggests that riders just wait for the next bus, a tactic that will make their wait even longer, rather than addressing problems with uneven service.
What alternative might be used to measure service quality? Tactics on other transit systems vary, and it is not unusual to find “on time performance” including an accepted deviation elsewhere. However, this is accompanied by a sense that “on time” matters at more than the terminal, and that data should be split up to reveal effects by route, by location and time of day.
Some systems, particularly those with frequent service, recognize that riders do not care about the timetable. After all, “frequent service” should mean that the timetable does not matter, only that the next bus or streetcar will be reliably along in a few minutes.
Given that much of the TTC system, certainly its major routes, operate as “frequent service” and most are part of the “10 minute network”, the scheme proposed here is based on headways (the intervals between vehicles), not on scheduled times.
In this article, I propose a scheme for reporting on headway reliability, and try it out on the 29 Dufferin, 35 Jane and 501 Queen routes to see how the results behave. The two bus routes use data from March 2021, while the Queen car uses data from December 2020 before the upheaval of the construction at King-Queen-Roncesvalles began.
This is presented as a “first cut” for comment by interested readers, and is open to suggestions for improvement. As time goes on, it would be useful for the TTC itself to adopt a more fine-grained method of reporting, but even without that, I hope to create a framework for consistent reporting on service quality in my analyses that is meaningful to riders.
March 28, 2021, will see revenue service begin from the TTC’s new McNicoll Garage. This will entail the reassignment of many routes between all garages as the TTC rebalances it fleet and service to relieve crowding and minimize dead-head times.
There are few service changes associated with this grand shuffle. The primary effect is that garage trips at the end of peak periods will change to reflect the shift of some routes to a new home in northern Scarborough.
For example, north-south routes that formerly had transitional peak-to-evening service southbound will go to evening service levels sooner because buses will dead head to McNicoll rather than making a southbound trip before running back to Eglinton or Birchmount Garage.
129 McCowan North
The short-turn point for 39 Finch East and 53 Steeles East off-peak garage trips will change so that buses do not double back on themselves. These trips will be shortened to end at Kennedy rather than at Markham Road. Trips on 39C to Victoria Park will end at McNicoll & Victoria Park rather than at 480 Gordon Baker Road.
The 45 Kipling and 945 Kipling Express move from Queensway to Arrow. Trips to the garage after the AM and PM peak will no longer make southbound trips. Trips at the beginning of the PM peak will no longer travel north from Queensway.
The old and new garage assignments are at the end of this article for those who are interested.
Fleet utilization continues to be well below system capacity. In January 2020, the total AM peak buses in service was 1,625. In March 2021, it will be 1,527. This does not include buses used in Run As Directed (RAD) service. Although the TTC now has an additional bus garage, its capacity is not included in the table below.
For comparison, here is the January 2020 (pre-pandemic) table.
The number of buses used on streetcar routes continues to be high. These vehicles are included in the counts above, and represent additional capacity available for bus routes when the construction projects now underway finish. 506 Carlton will return to all-streetcar operation in May, but other routes will be affected by construction for much of 2021 notably at KQQR and on Broadview north of Gerrard (starting in May).
Here is the streetcar peak service table. Note that there is an error in the afternoon peak “base going into Mar 2021” column where the streetcar total should read 127, not 142.
During the construction of McNicoll Garage, all trips on 42 Cummer were operated as 42A to Middlefield. This will continue, and the 42B and 42C services will remain suspended. An eight month long water main project on Cummer will require that westbound service divert via Leslie, Finch and Bayview. New farside stops will be added southbound on Leslie at Cummer, and westbound on Cummer at Bayview to serve the diversion.
At the King, Queen, Queensway, Roncesvalles intersection (KQQR) construction work will block transit service beginning on March 31. This will affect all services that pass through this busy location.
501 Queen buses (501L Long Branch and 501P Park Lawn) will operate via King and Dufferin Streets to route. The official east end of the route will remain at Jarvis Street. In current operations, many runs have been extended as far east as River because the schedule is very generous in anticipation of construction traffic delays that have not yet materialized. Buses are also taking extended layovers at Long Branch Loop because they arrive early.
The 504 King west end shuttle will be broken into two parts.
A 504G King shuttle will operate between Dundas West Station and Roncesvalles Carhouse (entering and leaving via the North Gate).
A 504Q King shuttle will operate between Triller and Strachan. The west end loop will be via Dufferin, Queen and Triller. The east end loop will be via Duoro and Strachan. This is a change from the current shuttle terminus at Shaw.
Operation of the 506 Carlton bus shuttle will be officially changed to use the loop that was informally implemented almost immediately after this service began in January. All buses will loop via Gerrard, Sherbourne and Parliament. Full streetcar service will resume on 506 Carlton with the May 9, 2021 schedules.
Miscellaneous Route Changes
Weekday scheduled round-trip travel time on 1 Yonge-University-Spadina will be shortened from 161 to 154 minutes in recognition of time savings with Automatic Train Control. This will address some of the train queuing problems at terminals. Headways will also be widened slightly to reflect lower demand.
43C Kennedy service to Village Green Square will be modified so that all trips begin and end there. Half hourly service will be provided northbound from Kennedy Station from 6:30 to 8:30 am, and from 4:00 to 7:00 pm. Southbound service will leave Village Green from 5:58 to 8:28 am, and from 3:30 to 6:30 pm.
The Amazon Fulfillment Centre at Morningside & Steeles will be served by two routes:
53B Steeles service to Markham Road will be extended via Passmore to the cul-de-sac at the site. This operation is already in place.
102 Markham Road service will be routed north on Markham Road, east on Select Avenue, south on Tapscott Road, east on Passmore Avenue to cul-de-sac, west on Passmore Avenue, north on Tapscott Road, west on Steeles Avenue, to south on Markham Road. This route will be changed when the the intersection of Steeles & Morningside fully opens later in 2021.
Trip times on 167 Pharmacy North will be standardized so that the weekday and Saturday schedules are the same. The first trips will run northbound from Don Mills Station and southbound from Pharmacy Loop at 5:30 am. Service at all times will be on the half-hour (:00 and :30).
Articulated and regular buses will shuffle between routes:
Three artics now used on 60 Steeles West will be changed to standard buses. The artics will return in late May.
Most runs on 89 Weston will switch from artics to standard buses. In late May, all 89 Weston local buses will be standard-sized, but the 989 Weston Express service will resume.
Six standard buses now used on 929 Dufferin Express will be changed to artics.
310 Spadina night service will be cut to half hourly. This route was missed in January when other night services reverted to a 30 minute service (previously every 15 or 20 minutes).
Updated January 7, 2021: Comparative service level charts have been added for routes 53/953 and 60/960 showing changes between the November 2020 and January 2021 schedules.
Updated January 5, 2021: Information about express routes 953 Steeles East, 960 Steeles West and 984 Sheppard has been updated in the route summary. Comparative service charts will be added for weekday service on 953 and 960 in a separate update.
Updated December 26-28, 2020: This article has been extensively updated with charts to illustrate the change in service levels on corridors that have or had 9xx Express services. I will turn to other routes in a separate article.
Some of you have probably been wondering where my list of bus service changes for January 2021 has wandered off to.
The problem is that some of the information in the TTC’s service change memo is inconsistent, and a new version to be issued after Christmas. Some information about planned schedule changes is available through the City of Toronto’s Open Data Portal which has the electronic versions of all schedules for use by various trip planning apps.
Because the difference between some new and old schedules is not as straightforward as usual, I have added charts comparing service levels by time of day rather than the breakdown into peak, midday and off peak periods.
Information here should be considered “preliminary” in case the TTC makes further revisions before the new schedules take effect.
Scheduled Erratic Service
The schedules for many routes suffer from build-in irregular headways. If the route runs on time, the buses are not evenly spaced, and “on time” performance is the metric the TTC uses, for better or worse, to evaluate service. This irregularity arises from several factors that can also interact on the same schedule:
The route has branching services that are not on a compatible headway. For example, it is easy to blend two services running every 20′ to give a 10′ combined service on the common mileage. However, if it is a 25′ and a 10′ headway, this is impossible.
For pandemic-era schedules, some trips were cancelled without adjusting surrounding buses to even out the headways. This might have occurred unofficially, but it would take a lot of work to ensure that spacing stayed ideal even if the buses were not strictly “on time”.
For pandemic-era replacement of express services, “trippers” operated usually on schedules that did not blend with the basic service. These buses were typically in service from 5 am to noon, and from 3 to 10 pm.
Some “Run as Directed” (RAD) buses (aka Route 600 series) operated where needed to supplement scheduled service. These do not appear on any schedule nor in a route’s vehicle tracking logs.
My purpose in looking in detail at the January 2021 changes is to show how all of these factors interact.
In a series of articles, I reviewed the quality of service on many bus routes during a period, the lull in traffic and demand during the pandemic, when it should have been relatively easy for the TTC to operate reliable service.
A consistent factor on almost every route was that buses are running in bunches with wide gaps between them. Those gaps translate to crowded buses followed by lightly-used ones, and riders rightly complain about long waits and an uncertain arrival of the next group of vehicles.
The TTC argues that service is not really that bad because they have a large number of unscheduled extras (aka “RAD” or “Run As Directed”) buses that do not show up in vehicle tracking records. Leaving aside the obvious need to track all service, not just the scheduled buses, this does not explain why buses run so close together so much of the time. These are tracked vehicles that have a schedule that should keep them apart.
Or so one might think.
TTC Service Standards include provisions for headway quality (the reliability of spacing between vehicles), but this is fairly generous, and it is never reported on as an official metric of service quality.
However, another problem is that on some routes, the service is actually scheduled to come at uneven headways. This arises from three issues:
Some routes with more than one branch have different frequencies on each branch. This makes it impossible to “blend” service with, for example, alternating “A” and “B” destinations.
In response to the pandemic, the TTC quickly adapted schedules by cancelling all express buses, and selectively cancelling individual runs as a “quick fix” to avoid complete schedule rewrites across the system. Where local trips were cancelled, this created gaps in the scheduled service.
On many routes, notably those that formerly had express service, the TTC scheduled “trippers” to supplement the basic service. However, these trippers were generally not scheduled on a blended basis leaving riders with scheduled, but erratic service.
In some cases, the September and October schedules corrected some of these problems, but many persist. This article looks at a number of routes where the summer (August) schedules had uneven headways to see what, if anything, has changed by mid-October. (The most recent set of schedules went into effect on October 11, 2020.)
All of the data presented here were taken from the TTC’s schedules as they are published in GTFS (General Transit File Specification) format for use by travel planning apps. This almost exactly matches information on the TTC’s online schedule pages.
This article continues a series reviewing the quality of service scheduled and operated over the COVID-19 era in summer 2020 that began with an introduction and continued with Part I looking primarily at Scarborough. Part II moves further west looking at north-south trunk routes between Victoria Park and Jane.
There is a pervasive problem across the network shown in these data. Because of the need to quickly implement new schedules in May and June, two actions were taken:
Selectively crews were cancelled to reduce the number of vehicles and drivers. This produced gaps in the scheduled service.
Trippers were scheduled on many routes starting on June 22 to replace the ad hoc operation of standby buses. These trippers are in service in two seven-hour long waves with a break from midday to the start of the PM peak. In most cases, the headways of the trippers do not blend with those of the regular service causing scheduled bunching and gaps.
The TTC could manage its service to smooth out the schedule problems on the fly, but the actual vehicle tracking data suggests that little of this happens. The result is that vehicles on many routes operate at erratic headways and therefore with uneven wait times and vehicle loads.
Moreover, the schedules have not been adjusted to smooth out their problems, possibly because the TTC expects to go to revised schedules sometime in the fall based on resumption of some demand such as school trips.
In two cases, Dufferin and Keele, articulated buses are supposed to be operating, but in practice the trippers, which might account for half of the service, use standard sized buses thereby reducing capacity and adding to crowding.
Updated July 18, 2020 at 2:00 pm: 29 Dufferin is a route that I have been tracking for much longer than most bus routes. To give a longer perspective into travel times on the Dufferin corridor, I have added a section looking back to 2011.
Route 29 Dufferin is one of five corridors proposed for rapid implementation of reserved bus lanes in a proposal that will be at the TTC Board on June 17. Others include Finch East, Eglinton-Kingston-Morningside, Steeles West and Jane.
In this article, I will review travel times and speed data for Dufferin comparing conditions in April 2018 and May 2020. (2018 is used because I do not have any more recent pre-covid data.) The premise of this comparison is that May 2020 represents conditions on the route with all or most traffic congestion removed revealing the underlying conditions that would apply in a best case transit priority lane implementation.
Dufferin Street is very different from the other proposed corridors because for much of its length it is only four lanes wide with houses and businesses fronting onto the street and little or no opportunity for widening. On the northern portion where the street allowance is wider, there is a combination of four through traffic lanes with bays for right turns and bus stops.
Creation of a reserved lane will involve both a reduction of capacity for non-transit traffic and removal of parking. Depending on whether the lanes are in effect only during peak periods or longer, parking will be a big political issue as it was for attempts to improve transit operations on streetcar routes.
Before the King Street Pilot was proposed, the City reviewed parking regulations on the shoulders of peak periods to determine whether they should be extended. (Full disclosure: I worked on this project as a consultant.) With the growth of traffic over many years, the peak had expanded beyond its traditional 7-9 AM, 4-6 PM periods. Travel time charts would clearly show two super-peaks on either side of the official two-hour period as transit vehicles were fighting peak level congestion when parking and turn restrictions were not in effect. From this study, many areas had their peak periods extended by 30 or 60 minutes on either side of the original hours so that the period could be as long as 7-10 AM and 3-7 PM.
There was a lot of push back on this scheme from local businesses who regarded parking as essential to their operations, and there were tradeoffs in the final scheme to limit the expansion of peak restrictions. For example, a proposed no parking restriction on Broadview near Danforth was changed to end at 6:30 pm instead of 7:00 pm. It is worth noting that on Queen Street in The Beach there are no extended restrictions and the traditional two-hour windows apply. It would be intriguing to know whether Councillor Bradford, the author of the motion, would agree to elimination of parking in his ward in the name of speeding up the Queen car.
Parking is already banned in some locations on Dufferin Street from 7-10 AM and 3-7 PM, but the traditional hours are more common, and some locations have no restrictions at all. There are many locations where motorists would routinely move into a “reserved” curb lane to access off-street parking and laneways, as well as for right turns.
There is also the question of how bicycles would fit into any new street design.
Overall, the challenges on Dufferin Street are not straightforward and, like the much shorter King Street Pilot, they will require detailed block-by-block review.
Travel Times Between King and Wilson
In the following charts, note that changes in travel times will be due to a combination of two factors: the level of traffic congestion and the time spent at stops loading and unloading passengers. Transit priority can reduce the effect of congestion, but stop service times are a function of service level and demand, and especially of the degree to which crowding prevents a speedy movement of passengers onto and off of buses.
Budgetary constraints drive the TTC to run as close to its capacity standards, if not over them, as a routine practice. The degree of crowding is only rarely reported, and the cost in terms of service delays is not considered. A vicious circle can develop where headways are widened and travel times stretched in response to this type of delay, but this reinforces crowding problems while providing a “no cost solution” so beloved by simplistic political analysis.
In a recent article, I reviewed the TTC’s Service Standards Update. These standards included targets for headway reliability which are extremely generous and allow the TTC to claim that services operate “to standard” when actual rider experience is less than ideal.
Reliability of service is a top concern for TTC riders, and it has also been identified by TTC staff. Where the problem lies is that the targets offer little incentive to improve or measurement of just how bad the situation really is.
When the TTC talks about reliability, they inevitably trot out excuses about traffic congestion and the difficulty of operating service in mixed traffic. This has been a standard response to issues with streetcar routes for as long as I can remember. However, the typical TTC rider is a bus passenger, and this group has flagged service reliability, frequency and crowding as issues just as important as for streetcar riders.
Regular readers will know that over the years I have published many analyses of route performance looking mainly at the streetcar system, but also at selected bus routes. Recently, I decided to expand this to a number of routes in Scarborough where the quality of bus service often comes up in debates about the Scarborough subway extension, and to revisit some of the routes affected by construction on the Spadina extension which has now pretty much wrapped up. Apologies to readers in Etobicoke because this gives a central/eastern slant to the routes reviewed here, but I have no doubt that route behaviour in our western suburb is similar to that on the rest of the network.
This post may give some readers that dreaded sense of “TL;DR” because of the amount of material it contains. It is intended partly as a reference (readers can look at their favourite routes, if present), and partly to establish beyond any doubt the pervasiveness of the problem with headway reliability facing the TTC. This problem exists across the network, and setting performance targets that simply normalize what is already happening is no way to (a) understand the severity of the problem or (b) provide any measurement of improvements, should they be attempted.
The data here are taken from January 2017. The analysis would have been published sooner but for a delay in receiving the data from the TTC, a problem that has now been rectified. As always, thanks to the TTC for providing the raw material for this work.
Although January is a winter month, the level of precipitation, and particularly of snow, was unusually low for Toronto, and so weather delays do not lead to anomalies in the data.
The TTC’s current attitude to service reliability is to focus on conditions at terminals with the premise that if service leaves and arrives on time, then there is a good chance it will also be in good shape along the route. This is a misguided approach on two counts.
First and most important, there is little indication that service from terminals is actually managed to be reliable, and the “targets” in the standards provide a wide margin by which unreliability is considered acceptable. In particular, it is possible for services to leave termini running as bunches of two or more vehicles and still be considered “on target”.
Second, any variability in headway from a terminal will be magnified as buses travel along a route. Buses carrying larger headways (gaps) will have heavier loads and run late while buses closely following will catch up. The result can be pairs of buses operating at twice the advertised headway, and with uneven loads. Without active management of service at points along a route, the problems become worse and worse the further one progresses away from a trip’s origin. Again, the generous standards allow much of this service to be considered acceptable, and so there is no need, on paper, to actually manage what is happening.
TTC operators are a great bunch of people, overall, but the laissez faire attitude to headways allows those who prefer a leisurely trip across their route to run “hot” with impunity. The worst of them are, fortunately for riders, only a small group. The larger problem is the degree to which irregular headways are a normal situation across the system.
The balance of this article looks at several routes primarily for their behaviour near terminals as this matches the point where the TTC sets its targets, such as they are. To recap the Service Standards:
The TTC standards vary for very frequent (less than 5′), frequent (5′ to 10′) and infrequent (above 10′) services.
Very frequent services target a band of ±75% of the scheduled headway.
Frequent services target a band of ±50% of the scheduled headway.
Infrequent service aims for a range of 1 minute early to 5 minutes late.
The charts which follow look at actual headways, not scheduled values, and it is clear throughout that the typical range of values exceeds these standards.
[This is a long article, and I won’t hold it against anyone for failing to read all the way to the end, or not looking at every page of every chart. The issue here is a system-wide one of how service is scheduled and managed using routes where the TTC is attempting to improve operations as a reference.]
At the TTC Board Meeting of December 2015, Chief Service Officer Richard Leary gave a presentation “Performance Based Service” outlining the work done to date to improve the reliability of surface routes. [A YouTube video of the presentation is also available.]
The focus of changes made to several schedules has been that end-to-end running times should reflect actual on-street conditions rather than presenting drivers with an unattainable goal that cannot be met during typical conditions, let alone anything unusual such as poor weather or unusually bad traffic congestion.
The changes to date are summarized in the table below.
In some cases, the extra running time is provided simply by widening the headway. For example, if a route takes one hour, and it has a bus every 10 minutes, that’s six buses. Extending the headway to 11 minutes would change the round trip to 66 minutes with no added cost. In theory, if this allows vehicles to stay on time, better service might actually be provided because all buses would show up as planned. That, however, depends on them being properly spaced so that their capacity is evenly used.
In other cases, where the problem is not just scheduled time but also capacity, more vehicles can be added. In the example above, a seventh bus would allow the headway to stay at 10 minutes while the trip time went up to 70. With the long-standing problems of a constrained fleet, this is only possible in off-peak periods, or by raiding other routes for vehicles.