Day: July 28, 2021

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Service Reliability of 29/929 Dufferin

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.

Previous articles in the series:

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.

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A Dashboard for Scarborough Red Lanes

Recently, I published an article about the evolution of travel times and service quality on the Eglinton-Kingston-Morningside corridor since the installation of the transit priority “red lanes”, a project which has been branded RapidTO by the City. See: Red Lanes, Express Buses and Service Reliability in Scarborough

For clarity, although I have done work for City Planning as part of the King Street Priority project, I was not involved in the City/TTC Scarborough project. Analysis presented in my previous articles is my own work separate from the official reports.

One of the challenges of presenting this material is that there is a lot of data between transit vehicle tracking, ride counting and general traffic monitoring. In my articles, I only deal with the transit tracking component and even that is a lot. The City and TTC have boiled down the data further to present the major issues.

The City’s project page contains an overview and links to various resources including the TTC’s RapidTO page. The heart of reporting on the project is in the Project Dashboard which summarizes data showing effects on transit and general road user travel times as well as service reliability.

The High Points

The RapidTO lanes in Scarborough were the low-hanging fruit of potential transit priority projects. Much of their length already had peak period diamond lanes. The streets were not dependent on parking to serve commercial properties along the route, and they were mostly wide enough to leave two traffic lanes in each direction even after dedication of the curb lanes for transit.

Travel time changes were modest, and the savings cannot all be ascribed to the red lanes because other changes were made concurrently or after implementation, notably the elimination or relocation of stops.

Traffic and ridership volumes have not yet returned to pre-pandemic conditions and so we are not yet seeing either the roads or transit service stressed to previously-normal levels. Whether the red lanes will limit transit times from rising back to or above 2019 levels will probably not be known until sometime in 2022.

Service reliability continues to be the bugbear of TTC operations, and we are finally seeing figures to support this in a report from the TTC. When only half of service can achieve a rather generous target range of headways (time between buses), the service is not very reliable.

Update: Of particular note is the high reliability factor shown for the express routes, particularly 905 Eglinton East. The metric is defined as ±50 percent of scheduled headway, and the express routes have much larger headways than the 86 and 116 local Scarborough and Morningside services. Therefore, service on the 905 can be much more erratic because there is a wider acceptable window of values using the 50 percent rule. This is not necessarily better service, only a side-effect of a poorly-chosen metric.

The City and TTC present this metric as an “improvement” relative to October 2019, but the change is only a slight improvement on appallingly bad service. If this were a report card, it would generously have changed from an “F” grade to “E”.

External, physical changes to the route environment such as reserved lanes and stop consolidation will not, by themselves, produce reliable service, and the TTC has yet to address headway reliability management as a core function.

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