Loop 101 through Scottsdale will be closed for the second straight weekend to prepare for the next construction phase of a car-pool lane project.
Northbound lanes between 90th Street/Pima Road and Hayden Road will be closed from 10 p.m. Friday to 5 a.m. Monday.
The construction zone moving north means two more speed-enforcement cameras will be out of commission.
The northbound cameras at Shea Boulevard and Cactus Road will be shut down over the weekend.
Last weekend, the Arizona Department of Transportation closed the southbound lanes between Hayden and 90th Street/Pima Road and shut down the speed cameras at Raintree Drive and Shea Boulevard.
The two speed cameras farthest north, between Scottsdale and Hayden roads, will remain operative.
The closure will allow construction crews to adjust lane stripes and begin setting up temporary barriers to create a construction work zone.
The Loop 101 closure is part of a $47.5 million project that will add car-pool lanes in both directions between Loop 202's Red Mountain Freeway and Princess Drive. The entire 15 mile-stretch is scheduled to open in early 2009.
Motorists are advised to use northbound State Route 51 to avoid the seven-mile closure, ADOT spokeswoman Laura Douglas said.
There also will be a local detour.
For those exiting at 90th Street/Pima, go north to Mountain View and then east on Mountain View, which curves to become 92nd Street and 94th Street. Go west at Frank Lloyd Wright and north on Hayden Road to return to the freeway.