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Contact Information
Please Note Our New Location
Arapahoe County Lima Plaza
6924 S. Lima Street
Centennial, CO   80112
Phone: 720-874-6500
TDD: 720-874-6574
E-mail: Public Works & Development




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Home>> Departments>> Public Works & Development>> Engineering>> Traffic


What do I need to do to request additional signs be installed?
How can I request a signal be installed?
Can we add speed bumps to residential streets?
Can we request the speed limit be changed in a residential area?

If you would like to request additional signs or signals in your area, contact Traffic Engineering at 720-874-6500. The County will mail you a Traffic Engineering Services form to fill out for changes in signing, striping and/or signalization. Once received, the County will schedule a traffic study to investigate the request.

Once the investigation is complete, a notice is mailed letting you know our findings and recommendations. The County will not install certain traffic control devices to control speed, such as speed bumps/humps, drainage cross-pans, stop signs, etc. Under Colorado State Statute, the legal speed limit in a residential area is 30 MPH. This limit cannot be lowered unless a traffic study determines this speed is unsafe for existing conditions. 

The Sheriff’s Office also provides residential areas with additional enforcement. They can deploy their radar trailer on a street within a subdivision where speeding concerns exist, and also provide areas with information regarding inclusion into a Speed Enforcement Program. To request information on these programs, contact the Sheriff’s Office at 720-874-3600.