When should a traffic signal be installed?
Traffic: Signals
Traffic signals should be installed when they will alleviate more problems than they will create. This must be determined on the basis of an engineering study. 

Sources: Arizona DOT

A warranted traffic signal which is properly located and operated may provide for more orderly movement of traffic, and may reduce the occurrence of certain types of accidents. On the other hand, an unwarranted traffic signal can result in increased delay, congestion, and accidents. 

Many people seem to believe that traffic signals are the answer to all traffic problems at intersections. If this were true, no traffic engineer in his right mind would deny a request for a signal. 

However, a traffic signal only functions by stopping traffic, and any time a motor vehicle is stopped in the road an accident potential is created. It does not matter whether the stop is caused by a flat tire, a left turn into a driveway, or by a traffic signal - the possibility exists that a following motorist will not notice the stopped vehicle until it is too late. 

What traveler has not experienced that sickening feeling that occurs when a traffic signal suddenly turns amber a few hundred feet in front of him? Who has not experienced the aggravating hopelessness of waiting in a long line of cars for a traffic signal to change, moving ahead a few feet, and then having the signal turn red again? 

The need for traffic signals should be based on competent engineering study.
Created on Aug.  4, 2002 at  5:36 PM (PDT). Last updated by CityEngineer on May  4, 2010 at  9:58 AM (PDT). Owned by cmcmahon@ci.cypress.ca.us.
Catherine McMahon
Public Works Director
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