Drivers in the northwest Valley should plan for road and ramp closures this weekend along Loop 101, state transportation officials said.

The work will take place from Friday night, Oct. 17, until Monday morning, Oct. 20, according to the Arizona Department of Transportation.

Here is what drivers should prepare for:

• Southbound Loop 101 will be closed between 75th Avenue and Thunderbird Road from 9 p.m. Friday to noon Saturday for pavement sealing.

Westbound Loop 101 on-ramps at 59th and 67th avenues will be closed. Detours: Westbound Loop 101 drivers can consider exiting to southbound 59th Avenue before using westbound Thunderbird Road to reach Loop 101. Note: Crews will work to reopen southbound Loop 101 in sections as the pavement sealing advances.

• Northbound Loop 101 will be closed between Thunderbird Road and 75th Avenue from 9 p.m. Saturday to noon Sunday for pavement sealing.

Northbound Loop 101 on-ramps at Peoria Avenue and Cactus Road/91st Avenue will be closed. Detours: Northbound Loop 101 drivers can consider exiting ahead of the closure and using northbound 75th or 67th avenues to reach Loop 101. Note: Crews will work to reopen northbound Loop 101 in sections as the pavement sealing progresses.

• Eastbound Loop 101 will be narrowed to two lanes between 75th and 67th avenues and between 43rd and 27th avenues from 10 p.m. Friday to 6 p.m. Saturday for freeway lighting work.

The westbound Loop 101 HOV lane also will be closed in both of these areas.

• Loop 202 will be narrowed to two lanes in both directions between Cooper and Lindsay roads in the southeast Valley from 5 a.m. to 5 p.m. Saturday for a widening project.