9 Erskine Lane Traffic Impact Assessment - Sections 6.5.2 to 9.0

6.5.2 Full Build Out Traffic Operations 2033

A summary of the 2033 traffic analysis results for the intersections and site accesses in the study area after full build out, corridor growth, and site traffic is provided in Table 13 and Table 14.

Table 13 - 2033 Post Development Full Build Out

Note: ## - Exceeds storage/acceptable limits

Table 14 – Full Build Out 2033 Traffic Operations – Site Accesses

In the 2033 horizon year the impacts on the network in both the AM and PM peak hours are moderate. The intersections of Watkiss Way / Erskine Lane / Stoneridge Drive, Watkiss Way / Burnside Road W, and Watkiss Way / Hospital Access / Mall Access in both the AM and PM peak hour sees a maximum change in delay of 5 seconds or less and maintains LOS C or better on all movements. The 95th percentile queues change by 15 metres or less on all movements (i.e., approximately two car lengths) and remain acceptable.

The previously failed movements at Watkiss Way / Helmcken Road / Chancellor Avenue continue to fail in both the AM and PM peak hours with the northbound left movement experiencing an additional 10 seconds of delay in the AM peak hour and 83 seconds of additional delay in the PM peak hour, and the southbound left movement experiencing the same delay in the PM peak hour. The southbound left movement now also fails in the AM peak hour reaching LOS E with a delay of 66 seconds.

The 95th percentile queues remain acceptable on all approaches with an increase of 34 metres or less (i.e., five car lengths) from background conditions. The v/c ratios for all approaches are 0.89 or less for all movements.

All site accesses continue to operate well at LOS A with delays of 6 seconds or less, less than 1 second increase from 2023, and 95th percentile queues of 15 metres of less (i.e., approximately 2 car lengths), less than 1 metre increase from 2023. The v/c ratio for all movements is 0.07 or less. Figure 17 and Figure 18 show the traffic volumes for the site accesses in the AM and PM peak hours in 2033.

6.5.3 Watkiss Way / Erskine Lane / Stoneridge Drive Traffic Operations Change

Traffic control changes for the future scenario were modeled as they were in the 2023 scenario. A summary of the traffic analysis results in 2033 for the Watkiss Way / Erskine Lane / Stoneridge Drive intersection with traffic operation changes to either a roundabout or a traffic signal (assumes no dedicated turn lanes) is provided in Table 15.

Table 15 – Traffic Signal vs. Roundabout - 2033

Note: ## - Exceeds storage/acceptable limits

Comparing a change in traffic operation for the intersection of Watkiss Way / Erskine Lane / Stoneridge Drive in 2033 shows that both a traffic signal and a roundabout continue to work as a solution to improve traffic operations. A traffic signal still operates at LOS B or better with a delay of 19 seconds or less, and a roundabout continues to operate at LOS A with a delay of 4 seconds or less.

A traffic signal has a larger delay of 15 seconds or less over a roundabout in the AM and PM peak hours in 2033. The 95th percentile queues increase by 36 metres or less (i.e., approximately 5 car lengths) and the v/c ratio increases by 0.41 or less on any movement. These results demonstrate that either option will serve traffic acceptably, and the inclusion of left turn lanes on Watkiss Way would improve the signal performance results.

As with the 2023 results the intersection performs well under all traffic control types, including under stop-control.