Background Information

A reverse curve is located on SR$-675$ in a rural area of DeKalb County, AL between Milepost $25$ and Milepost $26.$ The ADT of the segment is approximately $1900$vpd and speed limit is $55mph.$

Upon review of the segment crash data, it was determined that all crashes were occurring in a reverse curve approximately $2000$ feet long, located approximately midway between Milepost $25$ and Milepost $26.$

The curve does not have any Horizontal Curve Series Warning signs and has not been evaluated for an advisory speed. The centerline and edge line striping is in fair condition. All crash vehicles are automobiles, unless otherwise noted.

Crash Data Summary

Crash data was analyzed for the segment between $\frac{1}{1}\frac{?}{12}$ and $12/21/14$ at various points within the reverse curve and are as follows:

Fatality: $1$ total. Single vehicle run$-$off$-$the road, at night, during wet weather

Type A: $3$ total. $2$ were single vehicle run$-$off the road crashes, and one was an opposite direction sideswipe. One of the run$-$off the road crashes occurred during wet weather and the other occurred at night. One of the vehicles involved in the opposite direction sideswipe was found to be traveling at $60mph$ through the curve.

Type B: $4$ total, all single vehicle run$-$off the road crashes, $2$ occurred during wet weather. $2$ crashes occurred at night and $1$ occurred at dawn.

Type C: $6$ total, all single vehicle run$-$off the road crashes: $4$ automobiles, $1$ pick$-$up truck and $1$ heavy truck. $3$ of them during wet weather and $4$ occurred at night.

PDO Crashes: $7$ total. $2$ involved heavy vehicles and the rest were automobiles. $5$ crashes were single vehicle run$-$off the road crashes $(3$ during wet weather and $4$ at night$)$ and $2$ were opposite direction side swipe $(1$ at night$).$

Based on the crashes, $4$ countermeasures are considered:

Install the appropriate curve warning sign series $($W$1-4,$ W$13-1$p$,$ and W $1-8)$ with Type XI sheeting $($fluorescent sheeting$).$ Total Cost: $$3,700.$ Project life $10$ years.

Renew the striping and install rpm$\text{'}$s on the edge line and centerline. Total Cost: $$4,000.$ Project life $5$ years.

Renew striping, install rpm$\text{'}$s$,$ and install the curve warning sign series. Total Cost: $$7,700.$ Project life $5$ years.

Install a high friction surface treatment. Total Cost: $$122,000.$ Project life $12$ years.

a$.$ Using the CMF Clearinghouse Website $($

cmfclearinghouse.org$),$ find the CRF$\text{'}$s for each of the countermeasures

b$.$ Based on your evaluation using the CMF$\text{'}$s only, recommend the best option. $($Look up necessary information and cite references if needed$).$ Document all of your work and cite references.

c$.$ What is the annual monetary benefits with the crash reductions for each of the countermeasures? Show your work.