Question

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?

Answer 1

average speed = 57.24 mph

Step-by-step explanation:

given data

average headway = 2.8 second

average spacing = 235 ft

solution

we get here first traffic flow that is

traffic flow =
`(1)/(2.8)`

traffic flow = 0.35714 veh/sec

traffic flow = 1286 veh/hour

and

density will be

density =
`(1)/(235)`

density = 0.004255 veh/ft

so

average speed will be

average speed =
`(1286)/(0.004255)`

average speed = 302232.6675 ft per hour

average speed = 57.24 mph