Question

At a three leg (T) intersection, the two-way peak hour volume on the minor road is 450 veh/hr and that on the major road is 650 veh/hr. As a Traffic Engineer, what type of intersection control will you propose? What is the basis of your proposal?

Answer 1

So this is basically a question where in you need to check the signal warrants and see if a signal is warranted

We are given its T intersection where

Major Road -two way flow = 650 veh/hour

Minor Road assume directional split is 50-50, so highest direction flow on major road is 450/2 = 325 veh/hour

Assume it is ONE LANE IN EACH DIRECTION on both major and minor road

So lets see the warrants with this

Warrant 01 - 8 hour vehicular volume

for a 1lane major, 1lane minor our flows are (750,300)

So it meets the warrant 01

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Warrant 02 - four vehicular volume is shown below. This point lies above the curves defined in MUTCD.

So warrant 02 - 4 hour vehicular volume is met

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WARRANT 03 - Peak hour warrant

Based on curve below THIS DOES NOT MEET THE PEAK HOUR WARRANT.

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So in summary we have

So I WILL NOT PROPOSE A SIGNAL.

Instead I will propose a Two-Way Stop Controlled intersection where the major road has no restriction and the minor road is stop controlled. Vehicles from the minor road can enter the major stream only if they find a sufficient gap to make the movement.

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