Traffic lights in Minneapolis resumed their normal timing Monday after a power failure knocked out their central computer for a week.

The coordination of the signal changes had been out of whack at many intersections throughout the city since Oct. 9, frustrating motorists and extending commutes. Engineers repaired the system Friday, and it was operating normally Monday, city officials said.

The central computer system operates about 700 of the city's 800 controlled intersections. Signals on busy Hiawatha Avenue operate independently of this system and were not affected.

After a surge of electricity crippled an Xcel Energy transformer on the western edge of downtown, a backup system that controls traffic signals kicked in. Motorists had to creep from red light to red light, because the lights were no longer timed to reduce stops along some of the city's arteries.

The city hopes to have a new computerized signal system that would prevent such problems in place by 2013.