Official Sources and Standards
The free, official standards that govern traffic control signs in California — and how the national, state, and local layers fit together.
Traffic control standards are layered. Knowing which document applies — and in what order — keeps a California traffic control plan defensible. Each resource below is free and opens the official government or federal website.
Free official resources
The national Manual on Uniform Traffic Control Devices (11th Edition), published by the Federal Highway Administration — the base standard all states build on.
Free official resource — opens official government website
- California MUTCD 2026 (Caltrans)California
California's adoption of the MUTCD with state-specific modifications. The CA MUTCD governs traffic control device use on California streets and highways (2026 edition effective January 18, 2026).
Free official resource — opens official government website
- FHWA Standard Highway Signs (2004 + 2012 Supplement)Federal Publication
Federal sign design details — layouts, dimensions, and legends used to fabricate signs to the MUTCD standard. Public domain.
Free official resource — opens official government website
- Caltrans Sign ChartsCalifornia
Caltrans sign charts catalog commonly used California sign codes and designs, including California-specific signs.
Free official resource — opens official government website
- Caltrans Sign Specification DrawingsCalifornia
Manufacturing specification drawings for California-coded (CA) signs — exact dimensions and layouts for fabrication.
Free official resource — opens official government website
- Caltrans Standard PlansCalifornia
Caltrans Standard Plans, including temporary traffic control (T-series) plans referenced on California TCPs.
Free official resource — opens official government website
Caltrans guidance and resources for work-zone temporary traffic control on the state highway system.
Free official resource — opens official government website
Los Angeles & regional agency references
For work in the Los Angeles area, these agencies review or permit traffic control. Each link opens the specific official agency page.
- Caltrans District 7 (LA / Ventura)Los Angeles
Caltrans District 7 covers Los Angeles and Ventura counties and reviews work on the state highway system in the region.
Free official resource — opens official government website
- Caltrans District 7 Encroachment PermitsLos Angeles
Where to apply for an encroachment permit for work within the state right-of-way in Los Angeles and Ventura counties.
Free official resource — opens official government website
Los Angeles Department of Transportation reference materials for worksite temporary traffic control plan (WTCP) review.
Free official resource — opens official government website
City of Los Angeles Bureau of Engineering (BOE) guidelines for short-term traffic control plan review on permit work.
Free official resource — opens official government website
- StreetsLA (Bureau of Street Services)Los Angeles
Los Angeles Bureau of Street Services — excavation/right-of-way permits and street-work coordination.
Free official resource — opens official government website
- LA County Public Works — Permit CenterLos Angeles
Los Angeles County Public Works permit center, including road encroachment permits for county roads.
Free official resource — opens official government website
How the standards layer
- National — Federal MUTCD (FHWA). The base standard for traffic control devices across the United States.
- State — California MUTCD 2026 (Caltrans). California’s adoption of the MUTCD with state-specific modifications. This is the controlling standard for California streets and highways, effective January 18, 2026.
- State design — Caltrans sign charts, sign specifications, and Standard Plans. Define how California signs are coded, dimensioned, and fabricated.
- Local — city and county requirements. Agencies such as the City of Los Angeles (StreetsLA, Bureau of Engineering) and LA County DPW may add requirements beyond the CA MUTCD. For state highways in the LA region, Caltrans District 7 reviews encroachment permits.
When the layers differ, the more specific and more stringent requirement generally governs — but always confirm with the agency that has jurisdiction over the roadway.
Educational reference only. This is not an official Caltrans, FHWA, or local agency publication and is not legal or engineering advice. Always verify sign selection, size, placement, spacing, and application against the current CA MUTCD 2026, Caltrans sign specifications, Standard Plans, project documents, and the reviewing agency’s requirements.
Need help applying these standards?
Public Ready works within the CA MUTCD, Caltrans specifications, and local agency requirements every day and can help you build compliant traffic control plans and sign packages.