5. The benefit-cost ratio is often applied to projects to look at their worth. W

Question

5. The benefit-cost ratio is often applied to projects to look at their worth. What is the expected ratio for a project to be considered a viable alternative? 6 What are the two components of stopping sight distance (SSD)? distance and distance 7. What are the key issues in the Empirical Bayes (EB) method that improve crash predictability. 8. What would be the crash rate of on a 3.0 mile stretch of SR 138 between South Kingstown and Richmond that averaged 10 crashes per year over the last three years? The two-way AADT is 2,500 in that segment.

Explanation / Answer

Prob 5.

Benefit cost ratio describes the monetary aspects of a project. It is the ratio of the total benefits(discounted values) to the total costs(discounted values) at the current rates. Any project that has a BCR greater than 1 is considered as a potential project.

Prob 6.

Lag Distance and Braking Distance.

Whenever an object is seen on the road, the driver takes time to perceive and react to the obstruction, this time is known as the reaction time, and the distance travelled by the vehicle in this time is known as the lag time.

While the Braking distance is the distance travelled by the vehicle from the instance the brakes are applied to the point when the vehicle becomes stand still. Therefore this distance depends upon the initial speed and brakes efficiency of vehicle.

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