Signals coordinate movements
Timing assigns right-of-way among competing traffic streams.
Detection can change operation
Sensors or connected controllers can adapt timing under some systems.
Power and communications matter
Loss of supporting services can change how an intersection operates.
Signals sit inside a network
Changing one junction can affect queues and travel time at adjacent intersections.
Scope boundary. This page explains system relationships at a planning level. Real utility, transportation, emergency, structural, electrical, cybersecurity and public-safety decisions require local agencies and qualified professionals.