Why a Signal System May Favor a Slower Pace
Traffic lights along a road can be coordinated so that a driver traveling at a chosen speed is more likely to reach the next intersection on green. Engineers call this signal progression. The timing is not simply a matter of making every light stay green longer: each signal’s schedule is offset from the next to account for how long vehicles take to travel between intersections.
If the chosen pace is slower than drivers might otherwise maintain, a vehicle moving too quickly can arrive before the next green and have to stop. That can discourage speeding, but it also shapes the flow of traffic: instead of encouraging a fast-moving wave that soon bunches up at a red light, the system can favor a steadier stream.
The Tradeoff Behind the Timing
A corridor cannot be optimized for every driver or direction at once. Signal plans must divide green time among competing traffic, and a timing pattern that helps vehicles moving one way may mean more waiting for cross traffic, pedestrians, or drivers going the other way. Actual arrival times also vary, so a carefully coordinated plan cannot guarantee a green at every intersection.
The aim is generally to manage the whole corridor, not to make one car travel as fast as possible. A slightly slower progression may mean fewer abrupt stops and less traffic piling up between lights. Drivers may experience that as a delay at a particular intersection, even when the timing is intended to keep the broader stream moving more predictably.
