Central District Projects

Horizontal Curve Warning Signs


The Arizona Department of Transportation, in association with the Federal Highway Administration, is improving horizontal curve warning signs on 111 miles of the state highway system located in and throughout Maricopa and Pinal counties.

The project will improve warning signage to notify for lane and roadway departures throughout the Phoenix area and surrounding communities.  The project is anticipated to last approximately six months and is scheduled to be completed summer 2019.

This project includes the following:

  • Replacement, relocation or installation of new horizontal curve warning and speed advisory signs
  • Installation of chevron signs
  • Installation or replacement of delineators

The highways where the updated signage and safety visuals will be installed include the following:

  • Interstate 17
  • Interstate 10
  • State Route 303
  • State Route 202
  • State Route 101
  • State Route 87
  • State Route 74
  • State Route 51
  • US 60

Work will occur within ADOT right-of-way throughout the project. Lane and ramp closures may be required in some areas, and detours will be provided where restrictions are in place. Most work is scheduled to occur during overnight hours.

Stay Informed

Schedules are subject to change based on weather and other unforeseen factors.  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 www.az511.gov, follow ADOT on Twitter (@ArizonaDOT) or call 511, except while driving.

ADOT Project No. 999 SW 000 F0143 01C

Federal Project No. HSIP 999-A(535)T

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