CMF / CRF Details
CMF ID: 8880
Implement systemic signing and marking improvements at stop-controlled intersections
Description: Double‐up (i.e., both right and left side) 36 in. x 36 in. intersection warning signs (W2- 22 series in the MUTCD (4)) on fluorescent yellow sheeting. Add advance street name plaque (W16‐8 in the MUTCD(4)) on fluorescent yellow 24 sheeting accompanying each right‐side intersection warning sign. Double-up (i.e., both right and left side) 48 in. x 48 in. STOP or YIELD signs (R1‐1 and 26 R1‐2 in the MUTCD(4)). Install retroreflective strips on sign posts for the above signs. Place minor road stop bars within 4 to 10 ft of the edge of the nearest through lane along the major road. Install yield bars at all lanes having yield conditions. Add dashed white edge-lines along the major road through the intersection. Remark all existing stop bars, crosswalks, arrows and word messages unless: o The roadway has been resurfaced within one calendar year and new thermoplastic markings have been applied. o Existing markings are uniformly reflective and above ground thickness is 90 mils or greater. o Otherwise directed by a district representative. Mark all turn lanes to include the pattern of lane arrows and text marking “ONLY” based on the turn lane length.
Prior Condition: Stop-controlled intersections without systemic signing and marking improvements
Category: Intersection traffic control
Study: Safety Effects of Low-Cost Systemic Safety Improvements at Signalized and Stop-Controlled Intersections, Le et al., 2017
Star Quality Rating: | [View score details] |
Rating Points Total: | 120 |
Crash Modification Factor (CMF) | |
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Value: | 0.718 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.039 |
Crash Reduction Factor (CRF) | |
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Value: | 28.2 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 3.9 |
Applicability | |
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Crash Type: | Nighttime |
Crash Severity: | All |
Roadway Types: | All |
Street Type: | |
Minimum Number of Lanes: | 2 |
Maximum Number of Lanes: | 4 |
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: | Rural |
Traffic Volume: | |
Average Traffic Volume: | |
Time of Day: | Night |
If countermeasure is intersection-based | |
Intersection Type: | |
Intersection Geometry: | 3-leg,4-leg |
Traffic Control: | Stop-controlled |
Major Road Traffic Volume: | Minimum of 641 to Maximum of 41731 Annual Average Daily Traffic (AADT) |
Minor Road Traffic Volume: | Minimum of 102 to Maximum of 8436 Annual Average Daily Traffic (AADT) |
Average Major Road Volume : | 11042 Annual Average Daily Traffic (AADT) |
Average Minor Road Volume : | 1453 Annual Average Daily Traffic (AADT) |
Development Details | |
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Date Range of Data Used: | 2005 to 2014 |
Municipality: | |
State: | SC |
Country: | |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (sites): | 245 sites before, 245 sites after |