Watch the lights to learn their sequence for timed lights. Watch the traffic at the intersection for trip lights.
Problem down here is that they change the lights about every 3 months. Even though they all have the ability for trip, the ones closest to the house are now on timed. Result, only two cars can get through on a green light, causing much frustration for everyone. Being cynical, I suspect they are changed periodically to ticket more people who get so frustrated that they run the light.
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