Would the signal affect traffic flow adversely because of incompatibility with another near-by signal?
These are just a few of the points traffic engineers take into consideration for determining when traffic signals should be installed. Before making such determination, traffic engineers first assess whether the conditions at potential traffic-signal locations meet the requirements established in nationwide standards. When the established appropriate standards and conditions for installing a traffic signal are met, the signal will normally operate effectively. When those standards and conditions are not met, the signal may only cause more problems.