CMF / CRF Details
CMF ID: 10275
Install adaptive traffic signal control
Description:
ATSC is a traffic management strategy in which traffic signal timings change, or adapt, based on observed traffic demand. These systems utilize increased detection to continually collect data on observed demand, and signal timings are then re-optimized based on current data.
Prior Condition: Time-based coordinated signal system
Category: Intersection traffic control
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.68 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.29 |
| Crash Reduction Factor (CRF) |
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| Value: | 32 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 29 |
| Applicability |
|---|
| Crash Type: | All |
| Crash Severity: | K (fatal),A (serious injury),B (minor injury) |
| Roadway Types: | Principal Arterial Other |
| Street Type: | |
| Minimum Number of Lanes: | |
| Maximum Number of Lanes: | |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Urban |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | All |
| If countermeasure is intersection-based |
| Intersection Type: | Roadway/roadway (not interchange related) |
| Intersection Geometry: | 3-leg,4-leg |
| Traffic Control: | Signalized |
| Major Road Traffic Volume: | Minimum of 19200 to Maximum of 21370 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | Minimum of 1300 to Maximum of 15560 Annual Average Daily Traffic (AADT) |
| Average Major Road Volume : | 20063 Annual Average Daily Traffic (AADT) |
| Average Minor Road Volume : | 6928 Annual Average Daily Traffic (AADT) |
| Development Details |
|---|
| Date Range of Data Used: | 2012 to 2016 |
| Municipality: | Champaign |
| State: | IL |
| Country: | |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (sites): | 6 sites before, 6 sites after |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Dec 07, 2019 |
| Comments: | This CMF is for Four- and Three-Leg intersections combined and uses calibrated-Illinois SPFs. The number of crashes in the after period were not reported in this study, however, they have been recorded as 300 to give 10 points as a beneift of doubt for one or more of the following: (1) number of miles/sites in the reference/treatment group, (2) number of crashes in the references/treatment group, (3) reporting AADTs for the aggregate dataset but not for the disaggragate dataset used for CMF development. |
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