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For signals in unincorporated Arapahoe County call the Transportation Division at 720-874-6500 . For signals on state highways (i.e. Arapahoe Road, Parker Road, etc.) notify the Colorado Department of Transportation Region 6 at 303-757-9511. For signals in incorporated cities (i.e. Aurora, Centennial, Littleton, Denver, Sheridan, etc.) notify the respective jurisdiction.