A lane on a freeway has the following characteristics: a) the average headway between vehicles is 2.8 second, and b) the average spacing between vehicles is 235 ft. What is the average speed of vehicles?

average speed = 57.24 mph

Explanation:

given data

average headway = 2.8 second

average spacing = 235 ft

solution

we get here first traffic flow that is

traffic flow   =  

traffic flow  = 0.35714 veh/sec

traffic flow  = 1286 veh/hour

and

density will be

density =  

density = 0.004255 veh/ft

so

average speed will be

average speed =  

average speed = 302232.6675 ft per hour

average speed = 57.24 mph

answer:

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