W3-3 Stop Ahead Sign
Warns that a STOP sign or temporary stop control is ahead, giving drivers advance notice to slow down before they reach the mandatory stop.
MUTCD-style sign reference illustration. Always verify against the official CA MUTCD and Caltrans sign charts.
| Sign code | W3-3 |
|---|---|
| Federal code | W3-3 |
| Name | Stop Ahead |
| Category | Warning Signs |
| Shape | Diamond |
| Color | Orange background, black legend (temporary traffic control use) |
| California status | Used in California per CA MUTCD |
| Typical CA minimum size | 48" × 48" on conventional roads; 60" × 60" on expressways and freeways |
📥 Sign Files & References
Download this sign or open the official MUTCD reference.
Official source: FHWA Standard Highway Signs, 2024 (11th Edition) — Warning & Temporary Traffic Control signs.
📚 Official Source Files
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.
What This Sign Means
Warns that a STOP sign or temporary stop control is ahead, giving drivers advance notice to slow down before they reach the mandatory stop.
Field Use Notes
Warns that a STOP sign or temporary stop control is ahead, giving drivers advance notice to slow down before they reach the mandatory stop. In the field, W3-3 Stop Ahead is typically positioned at the advance warning area, ahead of the work. Common deployments include advance warning of a temporary STOP sign at a crossover or closure; obscured or relocated stop control at a construction approach; one-lane crossover approaches where stop control is in use. Always confirm its size, retroreflective sheeting, spacing, and placement against the CA MUTCD 2026 and the reviewing agency before finalizing the traffic control plan.
🟠 Public Ready Field Notes
Used in California work zones where a temporary STOP sign is placed at a crossover, temporary intersection, or access control point, or where an existing STOP sign is obscured by construction activity.
Common field deployments
- Lane closure setups
- Shoulder closure advance warning
- Utility work zones
- Public right-of-way work permits
- Multi-phase construction staging
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.
Common TCP Context
- Advance warning of a temporary STOP sign at a crossover or closure
- Obscured or relocated stop control at a construction approach
- One-lane crossover approaches where stop control is in use
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 placement is far enough upstream for the posted speed that drivers can decelerate to a stop. Public Ready reviews stop-ahead advance warning placement.
Signs Commonly Used Together
These signs are typically deployed alongside W3-3 on a California TCP.
Rent or Purchase This Sign
Using a temporary STOP sign on a California project? Public Ready can supply STOP AHEAD (W3-3) and the supporting signs.
Official References
- California MUTCD (Caltrans)
Free official resource — opens official government website
- Federal MUTCD — 11th Edition (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
Related Compliance Information
To understand the bigger picture around permits, agency review, lane closures, and pedestrian access for work zones using W3-3 Stop Ahead, visit WorkZoneCompliance.com.
Need W3-3 Stop Ahead for a California project?
Public Ready can help with W3-3 Stop Ahead — including sign rental or purchase, work-zone signs, TCP sign legends, and permit coordination, and agency-review support for Caltrans District 7, the City of Los Angeles, and LA County.