Many, if not most, of the freeway on-ramps around Portland have these stoplights. They are generally running only during high traffic times of the day. The on ramp forms two lanes and the lights alternate, one car at a time, letting cars enter the highway. There is a short (2 second maybe) pause between cars. This does help traffic a little bit. However, I still think Portland traffic is surprisingly horrible for such a small city!
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