R4-17 · Do Not Drive on Shoulder
R4-17 Sizes & Dimensions
These are dimensions shown on the linked layout. Select the required size using the applicable MUTCD and agency requirements; the smallest drawing size is not necessarily the permitted minimum. All dimensions below are in inches.
Open R4-17 Official Dimension Drawing (PDF, opens in a new tab)Official PDF · Opens in a new tab
Dimensions from the Official Drawing
Dimensions transcribed from the exact official drawing and its size-specific artwork. Illustrated speeds, weights, fine amounts, and directional examples require project-specific selection.
- Official drawing size18" × 24"
Select using the applicable California MUTCD and agency requirements.
Drawing dimensions do not establish a permitted roadway minimum.
- Official drawing size24" × 30"
Select using the applicable California MUTCD and agency requirements.
Drawing dimensions do not establish a permitted roadway minimum.
- Official drawing size36" × 48"
Select using the applicable California MUTCD and agency requirements.
Drawing dimensions do not establish a permitted roadway minimum.
- Official drawing size48" × 60"
Select using the applicable California MUTCD and agency requirements.
Drawing dimensions do not establish a permitted roadway minimum.
Drawing dimensions are not a universal minimum or an agency approval. These are dimensions shown on the linked layout. Select the required size using the applicable MUTCD and agency requirements; the smallest drawing size is not necessarily the permitted minimum.
California Application & Variants
Use where the shoulder-driving prohibition needs emphasis. It does not itself establish an alternate travel lane.
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. Reference editions: California MUTCD 2026 (effective January 18, 2026) and the Federal MUTCD 11th Edition with Revision 1.
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