W20-1(CA) Road Work Ahead (California) Sign
The California application of the ROAD WORK AHEAD warning, reflecting CA MUTCD and Caltrans conventions for legend, size, and fluorescent orange sheeting in work zones.
| Sign code | W20-1(CA) |
|---|---|
| Federal code | W20-1 |
| Name | Road Work Ahead (California) |
| Category | Warning Signs |
| Shape | Diamond |
| Color | Fluorescent orange background, black legend |
| California status | California-specific (CA MUTCD) |
| Typical CA minimum size | 48" × 48" on conventional roads; 60" × 60" on expressways and freeways |
What This Sign Means
The California application of the ROAD WORK AHEAD warning, reflecting CA MUTCD and Caltrans conventions for legend, size, and fluorescent orange sheeting in work zones.
California Temporary Traffic Control Use
California uses the federal W20-1 with the CA MUTCD's California modifications, including sign sizes from the Caltrans sign specifications and Standard Plans for the roadway type.
Common TCP Context
- Caltrans and local-agency work zones in California
- Sized per Caltrans sign specifications for the road type
- Fluorescent orange sheeting for work-zone warning
California Size Requirements
Typical minimum: 48" × 48" on conventional roads; 60" × 60" on expressways and freeways.
Sizes are CA MUTCD minimums and vary by roadway classification and speed. Verify against the CA MUTCD 2026 (CA MUTCD Part 6 (Temporary Traffic Control), Chapter 6F; warning-sign design in Part 2C), Caltrans sign specifications, and the reviewing agency.
Common Placement on a TCP
Where it sits: Advance warning area, ahead of the work.
CA MUTCD reference: CA MUTCD Part 6 (Temporary Traffic Control), Chapter 6F; warning-sign design in Part 2C.
Los Angeles Area Usage Notes
In Los Angeles, this sign must conform to CA MUTCD 2026. Work in City of LA right-of-way is reviewed by StreetsLA and the Bureau of Engineering (BOE); state highways in LA County are permitted and reviewed by Caltrans District 7; county roads are permitted by LA County DPW. Sizes, retroreflectivity, and placement must meet CA MUTCD minimums — local agencies may require larger signs based on roadway class, speed, pedestrian volume, and proximity to schools or transit.
Common Plan Review Comments
- Sign not shown at the correct advance distance for the posted speed.
- Advance warning sign missing or out of sequence on the TCP.
- Wrong size specified for the roadway classification (conventional vs. expressway).
- Sign sheeting / retroreflectivity class not noted on the plan.
Plan Review Notes
Confirm California sizing and sheeting per Caltrans specs and the CA MUTCD. Public Ready checks California-specific sign details on the TCP.
Signs Commonly Used Together
These signs are typically deployed alongside W20-1(CA) on a California TCP.
Rent or Purchase This Sign
Need the California ROAD WORK AHEAD per Caltrans specs? Public Ready can supply correctly sized California work-zone signs.
Official References
- California MUTCD (Caltrans)
Free official resource — opens official government website
- Federal MUTCD (FHWA)
Free official resource — opens official government website
- Caltrans Sign Charts
Free official resource — opens official government website
- FHWA Standard Highway Signs
Free official resource — opens official government website
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.
Related Signs
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