Agenda - Council - 04/13/2021 - Laserfiche WebLink

Home

This configuration removes the highest delayed movement, the cross street left - turning movement (northbound left) from the intersection. These vehicles will now need to route east along Riverdale Drive to the northern Highway 10 Ramps on Armstorng Boulevard, where they will then be able to proceed westbound on Highway 10. In total, roughly 2.25 miles will be added to these vehicles drive, however with projected delays of 21 mintues to more than one hour by the 2040 build scenario, this rerouting will take less time than if the vehicles were to wait to complete a northbound left at the Hwy 10/ Riverdale Drive intersection. The restricted access mitigation was run for the 2040 scenario to determine if it was an effective solution for the delay concerns. The results were improved to: • 46 seconds of delay per vehicle for northbound vehicles with queueing of less than two vehicles in the 2040 a.m. build scenario. • 26 seconds of delay per vehicle for northbound vehicles with queueing of less than one vehicle in the 2040 p.m. build scenario. As previously mentioned, and based on our experience, improvements are not warranted at side -street stop -controlled intersections until the 95th percentile queue at a stop sign is in the five to ten vehicle range. This proposed mitigation reduces the queue to less than five vehicles and brings delays back to standard levels for side street movements at side -street stop -controlled intersections intersecting with busy roadways. The full capacity analysis results can be seen in the Appendix. d. Concept Site Plan & Multi -Modal Review The concept site plan contained in the Appendix was reviewed to determine if the plan meets city requirement's, provides appropriate circulation, and minimizes conflicts. Following are key transportation elements of the concept site plan: i. Car Circulation: vehicle circulation is provided in the site with two proposed accesses on Riverdale Drive. These accesses both provide connections to the entire site, meaning if one access becomes blocked due to a crash or vehicle breakdown, drivers will still be able to navigate the site and enter/exit using the alternate access. Additional future connection stub -outs are provided on the east and west of the site providing further connections when/if the area is built out further. ii. Truck Circulation: Heavy vehicle turning movements should be considered within the site. Specifically, the two internal cul-de-sacs should be designed in a way that garbage trucks can easily turn around without require any reversing movements. iii. Bicycle/Walking Paths: No bicycle paths are currently shown on the site plan. At a minimum, a ten -foot wide trail connection on the south side of Riverdale Drive, from the future Highway 10/Riverdale Drive intersection trail system to the trail system that starts on the east side of Riverdale Drive/Llama Street, should be provided. This connection will provide both walking and bicycle Traffic Impact Study 13 Riverstone South Development '#= Spak