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📘 Signals assign the right of way

A traffic light assigns right of way in a shared space where many movements cannot happen together.

3
lessons
~15 min
to learn
Adults
level
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What you’ll learn

  1. Conflicts and phasesExplain shared-space conflicts, phases, cycles, and timing splits.Signals assign compatible permissions in a repeating timed sequence.
  2. Demand, clearance, and peopleConnect detector calls, green limits, clearance intervals, and pedestrian timing.Actuated control and clearance protect the handoff between conflicting movements.
  3. The controller closes the loopTrace how a cabinet turns detector inputs and programmed rules into safe outputs.The controller repeats demand, decision, indication, clearance, and feedback.

Questions this course answers

What is the main job of a traffic signal at an intersection?

Signals assign permission in time so conflicting movements do not enter the shared space together.

Why are conflicting movements placed in different phases?

Phases separate movements whose paths would interfere if they were released together.

What can a vehicle detector do in an actuated signal system?

A detector supplies demand information; the controller uses it within programmed timing and safety rules.

What prevents one continuously demanded movement from holding green forever?

Maximum green places an upper bound on how long a phase may hold the right of way.

What is the purpose of a red clearance interval?

The all-red gap protects the handoff by delaying the next conflicting release.

Why can a turning vehicle and a pedestrian crossing require special attention?

A permitted turn can cross a pedestrian path, so drivers must yield and the timing plan must account for that conflict.

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