A backup system was used to control about 700 city intersections during the outage, but the signals were on timers rather than changing with the flow of traffic.
Red light stop. Green light slow.
A power failure Sunday is hurting Minneapolis motorists today. KARE 11 reports a power outage shut down the city's central traffic system, leaving a less sophisticated backup system to regulate traffic signal timing. City officials say motorists will likely notice the difference in traffic flow over the next few days.