Increased traffic is expected around South Lone Tree Road Monday through Friday in Flagstaff over summer. Roadways are expected to be the most congested between 12:30 and 1:30 p.m. The traffic is being caused by local road closures, in addition to parent pick-up for Flagstaff Unified School District summer programs which are being run at the Kinsey Inquiry and Discovery School. The programs will end on June 30th. FUSD asks motorists to remember that the speed limit is 15 mph when school is in session.