R10-18a TRAFFIC SIGNAL PHOTO ENFORCED Requirements
Application notes for R10-18a TRAFFIC SIGNAL PHOTO ENFORCED. The official manual distinguishes mandatory standards, recommended guidance, and optional applications; consult the linked sources for the provisions that apply.
1. When TRAFFIC SIGNAL PHOTO ENFORCED Is Used
Notifies road users of photographic enforcement of traffic-signal compliance.
- Signal control and supplemental instructions
2. Placement and Application Notes
Position R10-18a check the advance placement and support restrictions in CA MUTCD 2B.69.
- Place the sign where the intended road users have a clear, unobstructed view on approach.
- Use the mounting height and lateral placement specified for the sign and installation type.
- Use sign assemblies and supplemental plaques only as provided in the applicable manual and approved design.
3. Layout Sizes and Visibility Considerations
Linked-layout dimensions: 30" × 42"; 36" × 54". Check the applicable MUTCD and agency requirements for the required installation size.
- Choose size based on roadway speed, sight distance, and mounting location.
- Use the visibility and material requirements specified for this sign and installation.
4. Sign Selection Checks
- Confirm the actual enforcement location and applicable placement requirements with the responsible jurisdiction.
- Use the official drawing with the applicable California manual table and reviewing agency requirements.
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Verify R10-18a Requirements
This is an educational reference. Verify sign use, size, placement, and application against the current CA MUTCD, Caltrans sign specifications, Standard Plans, and the reviewing agency. Official source links are gathered in one place.
View official sourcesEducational 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. Reference editions: California MUTCD 2026 (effective January 18, 2026) and the Federal MUTCD 11th Edition with Revision 1.
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