Signal timing assigns traffic signal phases and durations to manage movements at an intersection.
Definition
Signal timing is the assignment of phases and durations within a traffic signal plan to manage movements at an intersection. A timing plan may account for traffic patterns, time of day, pedestrian needs, and the capabilities of the control system, as required by the project and road authority. A firm's work can include collecting or reviewing data, evaluating existing timing, developing proposed plans, and coordinating with agency operations staff. Owners define the intersections, periods, analysis tasks, and agency interfaces because these shape staffing and fee. Requirements and field responsibilities depend on the contract and jurisdiction. Signal timing is not the physical design of all signal equipment, a guarantee of improved operations, or ongoing maintenance. Implementation and operation are handled according to assigned responsibilities and agency processes. For transportation program context, see FHWA.
How owners use it
- Owners identify intersections, timing periods, data collection, and agency coordination in the scope.
- A team reviews 3 time periods at 2 intersections: 3 × 2 = 6 timing cases.
- Project managers track proposed timing plans separately from equipment design and field implementation.
- Owners clarify who approves, installs, operates, and maintains changes.
