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| Study Region (State) | Proposed Countermeasure(s) | Years of Data Used | Reference |
|
| California, Colorado, Delaware, Maryland, Minnesota, Oregon, Washington | Centerline Rumble strips on Rural Two-Lane Roads (Principal arterial) | 5 years prior & 3 years after | [25] |
|
| Wisconsin | Conversion of intersection into high speed roundabout on Rural and Urban (3-leg and 4-leg) | 3 years prior & 2 years after | [26] |
|
| Connecticut | Installation of fluorescent curve signs on Urban and Rural Two-lane Roads | More than 10 years data | [27] |
|
| Louisiana | Impact of Edge on Narrow Two-Lane Undivided Rural Highway | 3 years prior & 1 year after | [28] |
|
| Michigan, Minnesota, Washington, California | (i) Increase vertical grade by 1% on Two-Lane Rural Highway
(ii) Convert minor road stop control to all-way stop (rural)
(iii) Provide passing lane or climbing lane: Two-lane rural roads
(iv) Increase/ Reduce shoulder width on Two-Lane Rural Roads
(v) Changing from permissive to protected/ permissive or permissive/ protected phasing on 4-leg Urban signalized intersection | 5 years prior & 3 years after | [29] |
|
| Texas | Modify lane width on Rural frontage roads (one & two way) | Several years | [30] |
|
| Florida | Installation of bicycle lanes on multilane urban roads | 3 prior years & 2 years after | [16] |
|
| New York | (i) Increase cycle length for pedestrian crossing
(ii) Install high visibility crosswalk
(iii) Install traffic signal and provide split phase on 3-leg, 4-leg and more-leg urban signalized | 5 years prior & 2 years after | [31] |
|
| Florida, Kentucky, Missouri, Pennsylvania | Installation of lane narrowing through rumble strips and painted median on undivided Rural roads (3-leg and 4-leg stop controlled) | 5 years prior & 2 years after | [32] |
|
| Virginia | Installation of channelized separator islands on side road approaches with supplemental STOP signs on undivided Rural (4-leg stop controlled) | 5 years prior & 2 years after | [32] |
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