Which type of traffic signals incorporate detectors and gap counters, enabling phase skipping?

Actuated signals are designed to adapt to real-time traffic conditions by using detectors and gap counters. This technology allows them to determine the presence of vehicles at an intersection and adjust the signal phases accordingly. When there is a low volume of traffic detected in a particular direction, actuated signals can facilitate phase skipping, which means they may skip certain phases that would normally activate if sufficient vehicles were present. This is particularly beneficial for improving traffic flow and reducing delays at intersections during off-peak times.

The use of detectors enables these signals to respond dynamically, as they gather information about the number of waiting vehicles, their speed, and the gaps in traffic. This data allows the signal to optimize its operation, enhancing efficiency and safety for all road users. The ability to adapt to changing circumstances sets actuated signals apart from fixed-time signals, which operate on a predetermined cycle regardless of actual traffic conditions, and manual signals, which require human intervention. Responsive signals, while they adjust to real-time situations, do not specifically utilize gap counters in the same manner as actuated signals do for phase skipping.