The stoplights on a street are designed to keep
traffic moving at 37 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.
V=34mi/h * 1609m/mi * 1h/3600s.=15.2 m/s.
d = V*t = 80 m.
15.2t = 80.
t = 5.3 s.