Traffic signals are sometimes used at ______ or ______ on-ramps to allow for more fluid merging. These signals only use green and red.

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On high-speed roads, ramp metering uses signals on the on-ramp to control how many vehicles can enter the main traffic flow. By alternating red and green, the system creates regular gaps in the traffic, helping vehicles merge more smoothly and reducing speed differences that can cause bottlenecks. This approach is used on ramps that lead onto freeways or expressways, where the merging area and the mainline flow are moving quickly and need careful coordination. The other options describe locations that aren’t where ramp meters are applied—intersections and roundabouts are separate nodes where traffic crosses or yields, streets and alleys aren’t specific high-speed entry points, and pedestrian crossings focus on pedestrian movement rather than vehicle merging.