Warns that the road ahead is closed and that through travel will not be possible, giving drivers time to turn or follow a detour before reaching the closure.
MUTCD-style sign reference illustration. Always verify against the official CA MUTCD and Caltrans sign charts.
| Sign code | W20-3 |
|---|---|
| Federal code | W20-3 |
| Name | Road Closed Ahead |
| Category | Warning Signs |
| Shape | Diamond |
| Color | Orange background, black legend |
| California status | Used in California per CA MUTCD |
| Typical CA minimum size | 48" × 48" on conventional roads; 60" × 60" on expressways and freeways |
Download this sign or open the official MUTCD reference.
Official source: FHWA Standard Highway Signs, 2024 (11th Edition) — Warning & Temporary Traffic Control signs.
Source: FHWA Standard Highway Signs — Public Domain. California: CA MUTCD 2026 (effective Jan 18, 2026).
Files linked from FHWA are official government publications in the public domain. CA MUTCD and Caltrans links open official government websites. Always verify against the current edition.
Warns that the road ahead is closed and that through travel will not be possible, giving drivers time to turn or follow a detour before reaching the closure.
Warns that the road ahead is closed and that through travel will not be possible, giving drivers time to turn or follow a detour before reaching the closure. In the field, W20-3 Road Closed Ahead is typically positioned at the advance warning area, ahead of the work. Common deployments include advance warning ahead of a full roadway closure; used with R11-2 / R11-3a and detour markers; common on utility cuts, paving, and emergency closures. Always confirm its size, retroreflective sheeting, spacing, and placement against the CA MUTCD 2026 and the reviewing agency before finalizing the traffic control plan.
Placed in advance of a closure in a California TTC zone, working together with regulatory ROAD CLOSED (R11-2) signing and detour route markers at the closure point.
Common field deployments
Agency review note
StreetsLA, LA County DPW, and Caltrans District 7 may require larger sizes or additional devices. Verify with the reviewing agency before finalizing the TCP.
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.
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.
In Los Angeles, full closures typically require coordination with LADOT for signal timing, LA County Metro where transit routes are affected, and public-notice requirements under City or county ordinance. On state highways in LA County, Caltrans District 7 reviews the encroachment permit; county roads are permitted by LA County DPW. Confirm closure limits match the approved permit exactly.
Confirm the warning is paired with regulatory closure signing and a viable detour or local-access plan. Public Ready reviews closure and detour coordination.
These signs are typically deployed alongside W20-3 on a California TCP.
Closing a road on a California project? Public Ready can provide ROAD CLOSED AHEAD (W20-3) and the matching closure and detour signs.
Free official resource — opens official government website
Free official resource — opens official government website
Free official resource — opens official government website
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.
To understand the bigger picture around permits, agency review, lane closures, and pedestrian access for work zones using W20-3 Road Closed Ahead, visit WorkZoneCompliance.com.
Public Ready can help with W20-3 Road Closed Ahead — including sign rental or purchase, road-closure signs, barricades, closure permits, and agency coordination, and agency-review support for Caltrans District 7, the City of Los Angeles, and LA County.
