Drivers can expect heavy traffic at certain times over the Thanksgiving weekend, but it won’t be due to freeway construction projects, state transportation officials said.

The Arizona Department of Transportation and its contractors will not schedule any full construction or maintenance closures on state highways, including Phoenix-area freeways, from Wednesday afternoon, Nov. 22, to Monday morning, Nov. 27, ADOT announced.

“Drivers should prepare for their trips ahead of time and ‘expect the unexpected’ while focusing on safe driving, being patient and alert when on the road,” officials said.

Sixteen people were killed last year over the holiday weekend in a total of 16 fatal crashes on all Arizona roads, including local streets. Four of those fatalities occurred in crashes listed as alcohol related, according to ADOT.

“Due to anticipated heavier traffic conditions during peak travel times including Wednesday and Sunday afternoons, motorists should try to get an early start, allow extra time if possible and be prepared for unscheduled closures or lane restrictions due to crashes, disabled vehicles, inclement weather or other incidents,” officials said.

Highways that will be busy with holiday travelers include Interstate 17 and State Route 87 north of Phoenix as well as I-10 in areas between the Tucson or Phoenix metro areas and California, according to ADOT.