Traffic control device design follows the Manual on Uniform Traffic Control Devices (MUTCD) 11th Edition as supplemented by the CA supplement. Sign placement: lateral offset minimum 6 ft from edge of traveled way on rural roads, 2 ft from face of curb on urban roads. Sign height: minimum 5 ft bottom of sign on rural, 7 ft on urban. Retroreflectivity per FHWA minimum levels. Signal design per MUTCD Part 4 with CA state-specific signal timing policies.
References: AASHTO current edition, CA Standard Specifications, FHWA Technical Advisories, and applicable federal regulations (23 CFR). Contractors shall maintain current copies of all referenced standards on the project site.
Source: Caltrans Highway Design Manual, 2024 Edition. Pages 27–28 of 37.