W20-1(CA) Road Work Ahead (California)
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. Official depiction: Caltrans CA Sign Chart, 2014 Revision 3 (Sheet 15), where it is shown as the federal W20-1 face. This is the California version of the federal W20-1 “Road Work Ahead”; the federal W20-1 specification is available in this repository. No standalone Caltrans specification drawing is published for this sign.
- Sign Name
- Road Work Ahead (California)
- General Meaning
- 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.
- MUTCD Code
- W20-1(CA)
- Typical Use
- Advance warning area, ahead of the work.
- Sign Category
- Warning Signs
Specifications
- Standard Shape
- Diamond
- Background Color
- Fluorescent Orange
- Legend / Symbol
- Black legend
- Border
- Black
- Reflectivity
- High Intensity (for nighttime visibility)
- Compliance
- CA MUTCD (California)
Standard Sizes (inches)
- 30 in Diamond30" × 30"
- 36 in Diamond36" × 36"
- 48 in Diamond48" × 48"
- 60 in Diamond60" × 60"
Material / Application Notes
Caltrans and local-agency work zones in California. Confirm placement and supplemental plaques against the applicable CA MUTCD standard.
View this sign on the CA MUTCD (Caltrans)California Notes
California-specific application notes and adoptions may differ. Review California requirements where applicable.
What It Means / When This Sign Is Used
In the field, W20-1(CA) Road Work Ahead (California) is typically positioned at the advance warning area, ahead of the work. Common deployments include caltrans and local-agency work zones in California; sized per Caltrans sign specifications for the road type; fluorescent orange sheeting for work-zone warning. Always confirm its size, retroreflective sheeting, spacing, and placement against the CA MUTCD 2026 and the reviewing agency before finalizing the traffic control plan.
Learn more about Road Work Ahead (California) sign requirementsWhen & Where It's Used
- Caltrans and local-agency work zones in California
- Sized per Caltrans sign specifications for the road type
- Fluorescent orange sheeting for work-zone warning
Placement on a Traffic Control Plan
- 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
- Typical minimum size
- 48" × 48" on conventional roads; 60" × 60" on expressways and freeways
California / Field Use Notes
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.
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.
Confirm California sizing and sheeting per Caltrans specs and the CA MUTCD. Public Ready checks California-specific sign details on the TCP.
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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. Local jurisdictions may impose additional requirements, and final selection, placement, and dimensions may require engineering judgment or agency approval. Written against California MUTCD 2026 (effective January 18, 2026) and the Federal MUTCD 11th Edition. Official sources last verified June 2026.
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