MUTCD 11th Edition (2023)
Section 2C.40 — Reduced Speed Limit Ahead and Speed Zone Signs (W3-5, W3-5a, W3-5b, and W3-5c)
Manual on Uniform Traffic Control Devices, Section 2C.40. Standards, guidance, options and support statements, with figures and cross-references.
Section 2C.40 Reduced Speed Limit Ahead and Speed Zone Signs (W3-5, W3-5a, W3-5b, and W3-5c) and W3-5c) Guidance: 01 A Reduced Speed Limit Ahead (W3-5 or W3-5a) or Truck Speed Zone Ahead (W3-5c) sign (see Figure 2C-9 ) should be used to inform road users of a reduced speed zone where the speed limit is being reduced by more than 10 mph, or where engineering judgment indicates the need for advance notice to comply with the posted speed limit ahead. 02 A VARIABLE SPEED ZONE AHEAD (W3-5b) sign (see Figure 2C-9 ) should be used to inform road users of a zone where the speed limit is varied by…
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