This is what the Bay Area highway on-ramp traffic lights do. They rate limit traffic merging onto the highway thereby avoiding stop and go jams. That results in

This is what the Bay Area highway on-ramp traffic lights do. They rate limit traffic merging onto the highway thereby avoiding stop and go jams. That results in an overall increase in throughput on the highway at the cost of forcing vehicles to queue at the ramps. The overall travel time is lower despite the time spent waiting in the on-ramp queue.