Question

The stoplights on a street are designed to keep traffic moving at 26 mi/h. the average length of a street block between traffic lights is about 80 m. what must be the time delay between green lights on successive blocks to keep the traffic moving continuously? there are 1.609 × 103 m in a mile. answer in units of s

Answer 1

We use the formula,

`v = (d)/(t)`.

Here, v is velocity and its value given 26 mi/h ( in m/s,
`(26 * 1.609 * 10^(3) m)/(60 * 60 s) =11.62 \ m/s` ) and d is distance and its value is given 80 m.

Substituting these values in above formula we get,

`t = (80 m)/(11.62m/s ) = 6.88 \ s`

Thus, the time delay between green lights on successive blocks to keep the traffic moving continuously is 6.88 s