Recalculation of Controller Interval Timing Sample Clauses

Recalculation of Controller Interval Timing. The basic vehicular interval timing parameters (i.e., the minimum greens, the extensions, yellows, and all-reds) are a function of the approach speeds and the roadway and intersection geometry (street widths, grades, etc.). The Engineer will recalculate the vehicular clearance times. In the case of pedestrian timing (e.g. walk and flashing don’t walk), some intersections may require recalculation of these intervals based on new requirements that were made effective by the 2011 edition of the Texas Manual on Uniform Traffic Control Devices (TMUTCD). These changes include the following: • Assumed walking speed of 3.5 feet per second (rather than 4 feet per second); • Pedestrian clearance distance from near edge of travel way to far edge of traveled way (rather than from near edge of traveled way to middle of far traffic lane); and • Walk plus pedestrian clearance time adequate to walk from pedestrian push button to opposite edge of traveled way at a speed of 3 feet per second. The Engineer will recalculate the pedestrian interval timing parameters at all of the project intersections. Also, since any increases in pedestrian clearance times will impact minimum phase times, this recalculation will need to occur before cycle length decisions are made.