It may surprise you to learn that adding more stop signs or traffic signals along a roadway does not necessarily slow drivers down or increase safety. In fact, the overuse of signs and signals can lead drivers to ignore or not properly obey them.
Too many signs can lead to ineffectiveness
Studies have shown that when stop signs are placed at intersections where they don’t appear to be needed, motorists become careless about stopping.
Too many traffic signals can negatively impact traffic flow
Installing traffic signals where they are not needed can create traffic congestion, add travel time, and frustrate drivers, who may start driving impatiently.
Other options can provide safety
To make travel efficient and safe, and to help ensure the proper observance of stop signs and traffic signals, they are usually installed only where they are absolutely necessary. Other solutions, for example, a yield sign may also provide enough safety without affecting traffic flow.