Question

A traffic light is needed at each intersection. How many traffic lights are needed if there are 5 streets in the town?

Answer 1

4 way intersection means 1 light each direction. 4 lights times 5 equals 20.

Answer 2

The number of traffic lights is needed if there are 5 streets in the town is 20.

Given

A traffic light is needed at each intersection.

What is a traffic light?

A set of automatically operated colored lights, typically red, amber, and green, for controlling traffic at road junctions and crosswalks.

One street intersects with the 4 other streets 2, 3, 4, 5.

Therefore,

The number of traffic lights is needed if there are 5 streets in the town is;

$= 4 \times 5\\\\=20$

Hence, the number of traffic lights is needed if there are 5 streets in the town is 20.

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