Question

The maximum capacity of a 2-lane carriageway of a four lane dual carriageway is 2000 veh/hour. due to pipe laying operations the width of two lane carriageway is reduced, restricting the maximum capacity to 1100 veh/hour. when the flow upstream beyond the influence of the bottleneck is reasonably steady and freeflowing at 1500 veh/hour. find i) the mean speed of traffic in the bottleneck ii) the rate at which the queue of the congested conditions outside bottleneck grows. the mean space headway when the vehicles are stationary is 8 m. the relation between speed and concentration is linear

Answer 1

Based on the maximum capacity as a result of the pipe-laying operations, and the maximum capacity without obstruction to the four-lane dual carriageway, the mean speed of traffic in the bottleneck is -2.73km.

What is the mean speed of traffic?

This can be found as:

= (Maximum restricted capacity - freeflowing rate) / (Kb - Ka)

= (1,100 - 1,500) / (209 - 62.5)

= -2.73 km/h

The rate that the queue outside the bottleneck grows is:

= Free flowing rate - (mean speed of traffic x ka)

= 1,500 - (-2.73 x 62.5)

= 1,670 veh/hour

Find out more on bottleneck at brainly.com/question/9551615

#SPJ1