Question

A signalized intersection has a sum of critical flow ratios of 0.72 and a total cycle lost time of 12 seconds. Assuming a critical intersection v/c ration of 0.9, calculate the minimum necessary cycle length.

Answer 1

Answer:

$T_o=82.1sec$

Explanation:

From the question we are told that:

Lost Time $t=12secs$

Sum of critical flow ratios $X=0.72$

Generally the Webster Method's equation for Optimum cycle time is is mathematically given by

 $T_o=\frac{1.5t+5}{1-x}$

 $T_o=\frac{1.5*12+5}{1-0.72}$

 $T_o=82.1sec$