A feasibility study was prepared and after careful review, PennDOT selected Option 1A for an oval roundabout with a single circulating travel lane. Build Option 1 Build Option 1A Build Option 2 Build Option 3 Build Option 4 (Initiated by CAC Members) Preferred Design Alternative and Traffic Simulation Results in improved traffic flow, particularly during the peak periods. Slight oval shape was selected based on public input as having a more desirable and aesthetic appeal. Based on the design, the traffic flow is very similar to the circular roundabout option. Addresses concerns at the closely spaced intersection with Machell Avenue Exiting motorists at Machell Avenue will be restricted to right-out only. Motorists wishing to turn left onto Memorial Highway (SR 0415) must turn right and travel through the roundabout to make a U-turn. The intersection design is pedestrian-friendly. Sidewalks and crosswalks are provided throughout. Crossing widths are great reduced to a single travel lane at all locations with pedestrian refuges provided on each approach with the roundabout’s splitter islands, enabling pedestrians to cross one direction of traffic at a time. Dallas Intersection Traffic Simulation (VISSIM software) Description: Traffic simulation (using VISSIM software) was completed to illustrate the future 2030 design year weekday afternoon peak hour operating conditions for the Dallas five-leg roundabout. Several video clips of the simulation are linked below. In order to prepare the traffic simulation, existing traffic data was collected during the weekday afternoon peak period. This traffic data was then projected into the future to the year 2030, so the traffic simulation illustrates more traffic than under current conditions. Additionally, due to the improved pedestrian connectivity, the number of pedestrians illustrated in the simulation is also much greater than observed today. The Dallas five-leg intersection roundabout design elements, as well as Machell Avenue and adjacent accesses, were incorporated into the traffic simulation. The existing bus stop along PA
A feasibility study was prepared and after careful review, PennDOT selected Option 1A for an oval roundabout with a single circulating travel lane. Build Option 1 Build Option 1A Build Option 2 Build Option 3 Build Option 4 (Initiated by CAC Members) Preferred Design Alternative and Traffic Simulation Results in improved traffic flow, particularly during the peak periods. Slight oval shape was selected based on public input as having a more desirable and aesthetic appeal. Based on the design, the traffic flow is very similar to the circular roundabout option. Addresses concerns at the closely spaced intersection with Machell Avenue Exiting motorists at Machell Avenue will be restricted to right-out only. Motorists wishing to turn left onto Memorial Highway (SR 0415) must turn right and travel through the roundabout to make a U-turn. The intersection design is pedestrian-friendly. Sidewalks and crosswalks are provided throughout. Crossing widths are great reduced to a single travel lane at all locations with pedestrian refuges provided on each approach with the roundabout’s splitter islands, enabling pedestrians to cross one direction of traffic at a time. Dallas Intersection Traffic Simulation (VISSIM software) Description: Traffic simulation (using VISSIM software) was completed to illustrate the future 2030 design year weekday afternoon peak hour operating conditions for the Dallas five-leg roundabout. Several video clips of the simulation are linked below. In order to prepare the traffic simulation, existing traffic data was collected during the weekday afternoon peak period. This traffic data was then projected into the future to the year 2030, so the traffic simulation illustrates more traffic than under current conditions. Additionally, due to the improved pedestrian connectivity, the number of pedestrians illustrated in the simulation is also much greater than observed today. The Dallas five-leg intersection roundabout design elements, as well as Machell Avenue and adjacent accesses, were incorporated into the traffic simulation. The existing bus stop along PA
ProjectInformatio%20Feb3rd2016.docx