Transportation Engineering - Traffic Flow Theory

The speed-density relation on a one-way, single lane road is shown in the figure, where speed u is in km/hour and density k is in vehicles/km. The maximum flow (in vehicles/hour) on this road is

The figure presents the time-space diagram for when the traffic on a highway is suddenly stopped for a certain time and then released. Which of the following statements are true?

For a traffic stream, v is the space mean speed, k is the density, q is the flow, vf is the free flow speed, and kj is the jam density. Assume that the speed decreases linearly with density. Which of the following relati...

Consider the four points P, Q, R, and S shown in the Greenshields fundamental speed-flow diagram. Denote their corresponding traffic densities by $k_P$, $k_Q$, $k_R$, and $k_S$, respectively. The correct order of these d...

Assuming that traffic on a highway obeys the Greenshields model, the speed of a shockwave between two traffic streams (P) and (Q) as shown in the schematic is _________ kmph. (in integer)

At a traffic intersection, cars and buses arrive randomly according to independent Poisson processes at an average rate of 4 vehicles per hour and 2 vehicles per hour, respectively. The probability of observing at least...

On a road, the speed - density relationship of a traffic stream is given by u=70-0.7k (where speed, u, is in km/h and density, k, is in veh/km). At the capacity condition, the average time headway will be

The relationship between traffic flow rate (q) and density (D) is shown in the figure The shock wave condition is depicted by

The speed-density relationship in a mid-block section of a highway follows the Greenshield's model. If the free flow speed is $v_f$ and the jam density is $k_j$, the maximum flow observed on this section is

Average free flow speed and the jam density observed on a road stretch are 60 km/h and 120 vehicles/km, respectively. For a linear speed-density relationship, the maximum flow on the road stretch (in vehicles/h) is _____...

The speed-density relationship for a road section is shown in the figure. The shape of the flow-density relationship is