ramp meter
noun1
Road, Transport A traffic light that is located at the end of an on-ramp to regulate vehicles entering a highway.
- There’s no delicate way to put this, so we’re just going to come right out and say it – we feel that ramp meters are underappreciated. […] Yet, it’s not uncommon to see drivers totally ignore a ramp meter and drive right through its red light.2014 February 5, “Ramp Meters: Unappreciated or just misunderstood?”, in Arizona Department of Transportation, archived from the original on 25 Jun 2022: