Name and briefly describe the five flow or movement rates that are inputs to the automobile LOS procedure for signalized intersections.

Question

What will be an ideal response?

Answer 1

The Base Saturation Flow Rate (so) is the maximum rate of flow across the stop line that can occur in a traffic lane. Default values given by the HCM are1900 pc/ln/h for metropolitan areas having a population of 250,000 and 1,700 pc/ln/h for all other areas.
The pedestrian flow rate is computed from the number of pedestrians in the crosswalk that interrupt the flow of right-turning vehicles from the approach under consideration, during the analysis period. Pedestrian counts should be taken for each walking direction of the pedestrians. Pedestrian flow rate is given as pedestrians per hour.
The bicycle flow rate is computed from the number of bicycles with a travel path that results in an interruption of the flow of right-turning vehicles from the approach under consideration, during the analysis period. Bicycle flow rate is given as bicycles per hour.
The On-Street Parking Maneuver Rate is the number of parking maneuvers per hour during the analysis period that have an impact on an intersection leg. The HCM suggests that a practical limit of 180maneuvers/h should be used. It should be measured on one side of the road on two-way legs and on both sides on a one-way leg.
The Local Bus Stopping Rate is given as the number of buses per hour during the analysis period that block traffic by stopping for embarking or disembarking passengers within 250 ft upstream of the stop line. The HCM suggests that a practical upper limit of 250 buses/ h should be used.