CMF / CRF Details
CMF ID: 6170
Lower posted speed from 160 km/h to 140 km/h
Description: Reducing the speed limit from 160 km/h to 140 km/h
Prior Condition: Speed Limit 160 km/h
Category: Speed management
Study: A Study of the Safety Impact of Speed Limit Reduction on Abu Dhabi Freeways, Abdelany et al., 2014
Star Quality Rating: | [View score details] |
Rating Points Total: | 115 |
Crash Modification Factor (CMF) | |
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Value: | 0.8435 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.1077 |
Crash Reduction Factor (CRF) | |
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Value: | 15.65 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 10.77 |
Applicability | |
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Crash Type: | All |
Crash Severity: | All |
Roadway Types: | Principal Arterial Other Freeways and Expressways |
Street Type: | |
Minimum Number of Lanes: | 4 |
Maximum Number of Lanes: | 4 |
Number of Lanes Direction: | |
Number of Lanes Comment: | |
Crash Weather: | Not specified |
Road Division Type: | Divided by Median |
Minimum Speed Limit: | 160 |
Maximum Speed Limit: | 160 |
Speed Unit: | km/h |
Speed Limit Comment: | |
Area Type: | Not specified |
Traffic Volume: | |
Average Traffic Volume: | 43934 Annual Average Daily Traffic (AADT) |
Time of Day: | All |
If countermeasure is intersection-based | |
Intersection Type: | |
Intersection Geometry: | |
Traffic Control: | |
Major Road Traffic Volume: | |
Minor Road Traffic Volume: | |
Average Major Road Volume : | |
Average Minor Road Volume : |
Development Details | |
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Date Range of Data Used: | 2006 to 2011 |
Municipality: | Abu Dhabi |
State: | notusa |
Country: | United Arab Emirates |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (sites): | 29 sites before, 29 sites after |
Sample Size (site-years): | 116 site-years before, 29 site-years after |
Sample Size (miles): | 99 miles before, 99 miles after |
Sample Size (miles): | 396 mile-years before, 99 mile-years after |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Mar 12, 2015 |
Comments: | This CMF for a road called "Maktoom". |