Intersection/Arterial Data
An intersection count consists of collecting turning movements (the number of vehicles making left, right, and through movements). Intersection counts provide a valuable insight into the turning movement characteristics and operational performance of intersections and are used for traffic signal warrant analyses, traffic safety analyses, forecasting, planning, seasonal peak development, and traffic mobility analyses.
Examples:
Allen County
Dekalb County
Allen County
Dekalb County
- Britton St. and Houston St.
More Description
The concepts of capacity and level of service are central to the analysis of intersections. Capacity analysis results in the computation of volume/capacity (v/c) ratios for each lane group. The v/c ratio is the actual or projected rate of flow on a designated lane group during a 15-minute peak interval divided by the capacity of the lane group. Although the capacity of the entire intersection is not defined, a composite v/c ratio for the sum of the critical lane groups within the intersection is computed as an indication of the overall intersection sufficiency.
Level of Service (LOS) is defined in terms of delay, which is a measure of driver discomfort, frustration, fuel consumption, and lost travel time. LOS is based upon the average stopped delay per vehicle for various movements within the intersection. LOS is defined alphabetically, A through F, where A indicates the best LOS and F indicates the worst LOS. LOS “A” describes operations with very low delays; most vehicles do not stop at all. LOS “C” describes operations with longer delays, stopping vehicles are significant but many still pass through without stopping. LOS “F” describes operations with delays unacceptable to most drivers, the intersection is exceeding capacity.
The concepts of capacity and level of service are central to the analysis of intersections. Capacity analysis results in the computation of volume/capacity (v/c) ratios for each lane group. The v/c ratio is the actual or projected rate of flow on a designated lane group during a 15-minute peak interval divided by the capacity of the lane group. Although the capacity of the entire intersection is not defined, a composite v/c ratio for the sum of the critical lane groups within the intersection is computed as an indication of the overall intersection sufficiency.
Level of Service (LOS) is defined in terms of delay, which is a measure of driver discomfort, frustration, fuel consumption, and lost travel time. LOS is based upon the average stopped delay per vehicle for various movements within the intersection. LOS is defined alphabetically, A through F, where A indicates the best LOS and F indicates the worst LOS. LOS “A” describes operations with very low delays; most vehicles do not stop at all. LOS “C” describes operations with longer delays, stopping vehicles are significant but many still pass through without stopping. LOS “F” describes operations with delays unacceptable to most drivers, the intersection is exceeding capacity.
