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Mobility Monitoring – Intersections – Overview
OVERVIEW • REGIONAL TRENDS • ROADWAYS • INTERSECTIONS • TRANSIT
BICYCLE/PEDESTRIAN • HOV LANES • TRANSPORTATION DEMAND MANAGEMENT • PARK-AND-RIDE
Overview • Interactive Database
Since 2002, Congestion Management Process (CMP) staff have monitored the performance of over 1,500 intersections in the region. Approximately 300 intersections were monitored through a detailed evaluation, with staff site-visits, data collection, and subsequent analysis and assessment, and through the gathering of data from existing MPO reports. The rest were monitored for approach delays using data collected during travel-time runs and safety statistics. Information about all of these intersections can be found in the Interactive Database.

The vast majority of intersections selected for performance monitoring are on regionally significant arterial roadways. They were identified as problem locations through travel-time monitoring, from safety analysis for vehicle, pedestrian, and bicycle modes, and from Conceptual or Pre-TIP projects listed in the Transportation Improvement Program (TIP). The database contains, at a minimum, information on peak-hour approach delays on the main road going through each intersection, as well as traffic volumes, crash data, transit routes, and bicycle and pedestrian facilities. In the CMP, delay is defined as the amout of time, beyond the first three seconds, for which a vehicle travels below 5 mph on a segment of roadway that approaches a signalized intersection. Intersections analyzed in more detail include a level-of-service analysis and field observations, resulting in recommendations for improvements and further study.

As a component of the Congestion Management Process, information from intersection performance monitoring is used to inform decisions about projects funded in the TIP. In addition, intersection performance monitoring supports the MPO´s Long-Range Transportation Plan (LRTP) by providing data for needs assessment.

The Intersection Delay Table (see the link at the right) lists intersections monitored through travel-time runs that were found to have approach delays of 80 seconds or more on the main road.