MUTCD 11th Edition (2023)
Section 6H.30 — Reverse Curve Signs (W1-4 Series)
Manual on Uniform Traffic Control Devices, Section 6H.30. Standards, guidance, options and support statements, with figures and cross-references.
Section 6H.30 Reverse Curve Signs (W1-4 Series) Guidance: 01 In order to give road users advance notice of a lane shift, a Reverse Curve (W1-4, W1-4b, or W1-4c) sign (see Figure 6H-1 ) should be used when a lane (or lanes) is being shifted to the left or right. If the design speed of the curves is 30 mph or less, a Reverse Turn (W1-3) sign should be used. Standard: 02 If a Reverse Curve (or Turn) sign is used, the direction of the reverse curve (or turn) shall be appropriately illustrated. Except as provided in Paragraph 3 of this Section, the number of lanes illustrated on the sign shall be…
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