Three easy ones I can think of are:
A timer - times intervals.
Under the road pressure/magnetic sensor - senses when a car is present in a controlled lane.
crosswalk switches - allow pedestrians to indicate a desire for a light change.
One might include:
Car motion sensors - to trigger taking a car's picture when it enetrs a intersection in the wrong sequence.
Live cameras - to send video traffic status data to a control center.
Strobe sensors - to sense the presence of an approaching emergency v ehicle.
A timer - times intervals.
Under the road pressure/magnetic sensor - senses when a car is present in a controlled lane.
crosswalk switches - allow pedestrians to indicate a desire for a light change.
One might include:
Car motion sensors - to trigger taking a car's picture when it enetrs a intersection in the wrong sequence.
Live cameras - to send video traffic status data to a control center.
Strobe sensors - to sense the presence of an approaching emergency v ehicle.