W10-1 · Railroad Crossing Advance Warning
W10-1 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 W10-1 Official Dimension Drawing (PDF, opens in a new tab)Official PDF · Opens in a new tab
Dimensions from the Official Drawing
Use California Table 8B-1 and its notes for roadway selection; pathway/sidewalk applications also reference Table 9A-1. Federal drawing sizes do not establish California installation minimums.
- Official drawing size24" diameter
Select using the applicable CA MUTCD roadway or pathway table.
Exact official drawing size; choose the applicable California use and size.
- Official drawing size30" diameter
Select using the applicable CA MUTCD roadway or pathway table.
Exact official drawing size; choose the applicable California use and size.
- Official drawing size36" diameter
Select using the applicable CA MUTCD roadway or pathway table.
Exact official drawing size; choose the applicable California use and size.
- Official drawing size48" diameter
Select using the applicable CA MUTCD roadway or pathway table.
Exact official drawing size; choose the applicable California use and size.
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
Round yellow railroad advance-warning sign with a black cross and two R letters. California Table 8B-1 lists roadway sizes of 36 and 48 inches in diameter.
Size selection: Use California Table 8B-1 and its notes for roadway selection; pathway/sidewalk applications also reference Table 9A-1. Federal drawing sizes do not establish California installation minimums.
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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