Statewide Horizontal Curve Warning Signs Project

The Arizona Department of Transportation is replacing, relocating or installing new horizontal curve warning signs, chevron alignment signs and delineators along various Arizona interstates, highways and freeways.

Horizontal curve warning signs are placed to improve safety by alerting the driver of a change in geometry of the road. Chevron alignment signs are used to provide additional emphasis and guidance for a change in horizontal alignment of the roadway.

Expect to see crews at work in different parts of the state during different times of the year.

ADOT will provide more specific information about project schedules and potential impacts as it becomes available.

Project Areas

The work will take place throughout north central and northwest Arizona.

Interstate 8
Interstate 10
Interstate 17
Interstate 40
State Route 40
State Route 61

State Route 67
State Route 68
State Route 69
State Route 87
State Route 89
State Route 89A

State Route 95
State Route 97
State Route 260
US 60
US 93


What to expect

The projects are scheduled to begin in fall 2020 with completion by spring 2021.

  • Lane restrictions or closures that impact travel could occur.
  • Drivers should expect lane and ramp restrictions or closures and plan for possible delays.
  • Drivers should slow down and use caution around construction personnel and equipment.

Stay Informed

Schedules are subject to change based on weather and other unforeseen factors.  Subscribe to receive project updates and traffic alerts by email. For more information, please call the ADOT Bilingual Project Information Line at 855.712.8530 or submit a question or comment by email.  For real-time highway conditions statewide, visit ADOT’s Traveler Information Site at, follow ADOT on Twitter (@ArizonaDOT) or call 511, except while driving.