This article continues the analysis of transit vehicle speeds on King and Queen Streets downtown over the past two years. The first installment of the article compared travel times between the vehicles on each street at specific times of the day and periods over the course of two years. Here, the same data are arranged to show the evolution of travel times on each street over time both before and after the implementation of the King Street Pilot.
Here is a sample chart showing King Street westbound in the hour from 8 to 9 am.
Three periods in 2017 (January, September and early November) are plotted in “warm” colours (pink, red, orange), while periods in 2018 with the pilot in operation (January, July and October) are plotted in “cool” colours (green, blue and purple). This makes it easy to distinguish the groups of data that belong to the “before” and “after” periods.
As this is westbound data, the chart is read from left to right. A common pattern that shows up here is the different location of low speeds corresponding to stops once the pilot is active with “before” data dipping ahead of the intersection, and “after” data dipping following. The degree to which “after” data also includes a nearside dip indicates how traffic signals can compound the stop service time with farside stops. Note especially the green line which shows data from before the re-activation of Transit Signal Priority (TSP). At Jarvis, for example, there is a decided reduction in nearside delay comparing the blue (July 2018) and purple (October) lines with the green (January) one. There is also an improvement at York Street and at University Avenue.