System Performance Criteria for the WILMAPCO Congestion Management Process

Fall 2019 Travel Time Measure : Freeway & Arterial Travel Time Reliability (TTR):

Travel Time Reliability (TTR) is a measurement of the variation between a given time period versus "freeflow" condiitions, measured during overnight hours. The measurement: establishes a reliability value for AM, PM, and weekend peaks (and non-peak) by measuring the differences between these travel times versus the measures off-peak hours (from 11pm-5am).

Hourly travel speed averages are collected AM/PM weekday and Summer weekends using the following data timeframes:
- Weekdays: Mondays-Thursdays from 2nd Monday in September to 2nd Thursday in November 2019

- Weekends: Second Friday in June to Second Sunday in August.

Intersection Level of Service Measure: "Volume" based LOS using Critical Movement Summation (CMS)

The CMS method looks at each of the "critical" movements at an intersection. This
method focuses on "raw" intersection capacity, that is, the ability for an intersection to process a given traffic demand (volume) with a given lane use configuration and given phase sequence. Measurement: Weekday traffic 6-9am for the AM period and 3-6pm in the PM period. LOS will be determined by the peak hour volumes for the AM and PM periods.

Crash Measure: Statewide Intersection Crash Assessment

Using the comprehensive intersection crash ranking which includes:

- Crash Frequency

- Crash Severity (i.e. Fatal, injuries, property damage only crashes)

- Crashes by Type (i.e. front to rear, sideswipe, head on crashes)

Analysis includes a 3-year average of crashes at signalized and non-signalized intersections that average 10 or more crashes per year. Approximately 300 intersections meet the 10 crashes/yr. threshold.

2020 CMP Performance Measures and Identified Corridors

The map below contains the most recent congestion performance measures for the WILMAPCO region. These measures serve as the basis for identifying the top corridors for more in-depth analysis and for an input into the project prioritization process.

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