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Warning · Rectangle · MUTCD 11th edition

W10-21aP Signal Ahead (plaque)

W10-21aP Signal Ahead plaque from the MUTCD 11th edition: 3 standard sizes (24" × 18", 30" × 24", and 42" × 30"), with letter heights, border widths, and colors.

Open this sign in the editorStandard sizes
W10-21aP
Drawn at 24" × 18"

01

Standard sizes

SizeRoad typeBorderCorner radiusLettersSIGNAL AHEAD
24" × 18"—5/8"1 1/2"4"FHWA Series D
30" × 24"—5/8"1 1/2"5"FHWA Series D
42" × 30"—3/4"1 7/8"8"FHWA Series C

02

Colors

Legend
Black
Background
Yellow
Border
Black

03

Standard reference

  • SHS 2024 sheet 3-146 (W10-21aP, 24x18 in); MUTCD 11th ed. Table 2C-1
  • SHS 2024 sheet 3-146 (W10-21aP, 30x24 in); MUTCD 11th ed. Table 2C-1
  • SHS 2024 sheet 3-146 (W10-21aP, 42x30 in); MUTCD 11th ed. Table 2C-1