Civic · 6 pages · 12 min
How a traffic signal's timing is a policy
Signal timing decides which movement gets green, and for how long, through the day.
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From the opening
A traffic signal's timing is the plan for how long each movement receives green, how the greens are ordered, and how neighboring signals relate. That plan is a policy because it allocates a scarce thing, time in the intersection, among drivers, people walking, and buses, rather than being a fact the intersection discovers on its own. The opening covers splits divide the green time, coordination favors one direction, and actuation still has chosen limits.
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Inside
- Splits divide the green time
- Coordination favors one direction
- Actuation still has chosen limits
- Priority can favor a bus
- Where the idea stops applying
- A distinction worth keeping
Sources
- Traffic signal timing plan
- Signal coordination and offsets