To determine which messages to automatically display, adaptable variable message sign technology acquires traffic information from satellite data networks and what other source?

keep quite, set up,sorry

people who make a question that includes something that isn't a question should be banned

we stop at red lights because, quite often, those who are crossing the intersection, with the right of way may very well t-bone your car and kill you, your passengers and even the people in the other car.

explanation: