2019.08.07 EDC Packet - Laserfiche WebLink

Home Browse Search

Traffic Impact Study 15 New Brighton Exchange Update b. Vehicular Mitigation Analysis Per the above analyses, the two signalized intersections are forecast to operate acceptably through the study scenarios. The side street stop-controlled intersections are forecast to operate acceptably in the a.m. peak hours but have some longer westbound queue lengths in the 2033 p.m. peak hour. Having the 14th Street and Central Park Boulevard intersections on Old Highway 8 operate with two westbound approaches improves operations, but longer than desired queues would still be present on westbound 14th Street. With the improved operations, it is recommended that the two westbound approach lanes be included on 14 th Street and Central Park Boulevard at Old Highway 8. The Minnesota Manual on Uniform Traffic Control Devices outlines thresholds when it may be appropriate for a traffic control device at an intersection. The criteria, also called warrants, are applicable for stop control or traffic signal control. Generally, on e or more warrants must be satisfied before a change to all-way stop or traffic signal control is considered, although meeting one or more warrants does not in itself require installati on of a traffic control device. Roundabouts do not currently have warrants to guide their installation as they can be both safety measures and capacity mitigation. In general, a roundabout is considered warranted if the traffic signal warrants are met. Signal warrant analyses were completed for the three stop-controlled study intersections on Old Highway 8 with the existing and 2033 Build volumes. For this study, the three volume-based warrants were examined; Warrant 1 (Eight Hour Vehicular Volume), Warrant 2 (Four Hour Vehicular Volume), and Warrant 3 (Peak Hour Vehicular Volume). Detailed results are included in the Appendix. Of the three warrants at these three intersections, the only warrants to be met were the peak hour volume warrant in the 2033 Build scenario at Old Highway 8/14th Street and Old Highway 8/Northwest Parkway. That means, based on volumes alone, two of these intersections would warrant a signal only during the busiest times of the day in the future. Typically, meeting peak hour warrants alone would not justify a signal. With acceptable sight distance results shown in Table 1 (aside from some minor modifications to intersection obstructions) and with safe operations (no identified crash issues, as shown in Table 2), a signal would not be needed for those other reasons. As traffic volumes are anticipated to continue to grow in the area, a signal may be warranted for more than just the peak hour based on volumes at some time in the future. An iterative analysis was done with the 2033 Build signal warrants to find the level that traffic volumes going to/from the side streets would need to increase to meet the four- hour warrants. For 14th Street it is 47%, for Central Park Boulevard it is 83% and for Northwest Parkway it is 109%. That means, that for Old Highway 8/14th Street, the volumes turning onto and off of 14th Street would need to be 47% higher than the 2033 Build projections to meet the four-hour warrant. Based on these results, a signal is likely to be warranted by volumes at some point in the future at one of these intersections. With the warrants not being met until well into