Question

On a two-lane highway, compared to the baseline, how much does the average travel speed decrease by if passing is allowed on the entire roadway, the free flow speed is 65 mph, and the opposing flow rate s 600 passenger cars/hour?

The answer is 1.4 but I did not know why

Answer 1

• As per U.S. Department of Transportation - Federal Highway administration guidelines on a two-lane highway, if passing is allowed on the entire roadway, the free flow speed is 65 mph, and the opposing flow rate s 600 passenger cars/hour the average travel speed decrease by 1.4 mph.

Summary- On a two-lane highway, compared to the baseline the average travel speed decrease by 1.4 mph if passing is allowed on the entire roadway, the free flow speed is 65 mph, and the opposing flow rate s 600 passenger cars/hour