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Home / MUTCD / Regulatory Signs

MUTCD Regulatory Signs — STOP, YIELD, All-Way & Speed Limit Rules

Regulatory signs — the ones that carry legal force — live in Chapter 2B of the MUTCD, 11th Edition. STOP, YIELD, all-way stop control, and speed limit signs all require engineering judgment or an engineering study, not just a request.

RequirementMUTCD 11th Ed. StandardSection
STOP sign (R1-1)30 × 30 in. standard on conventional single-lane roads; 36 × 36 in. on multi-lane; used only where a full stop is always required§2B.04
YIELD sign (R1-2)36 × 36 in. standard; for approaches where a full stop is not always necessary§2B.05
All-way stop controlBased on an engineering study — crash experience, sight distance, and volumes; ALL WAY (R1-3P) plaque below each STOP§2B.12, §2B.04
Speed limit (R2-1)Set from an engineering study considering roadway context; posted in 5 mph increments§2B.21
85th-percentile guidanceOn freeways and rural highways, the posted limit should be within 5 mph of the 85th-percentile speed§2B.21
Sign placementSpeed limit signs placed where the limit changes and beyond major intersections§2B.21
No message alterationsSecondary legends are prohibited on the STOP face; STOP and YIELD may not be displayed on changeable message signs§2B.04, §2B.05

Worth knowing

  • STOP signs are not a speeding or traffic-calming device — the MUTCD directs agencies to use the least restrictive control that is effective.
  • Meeting an all-way stop warrant does not require installation; engineering judgment still governs (§2B.12).
  • The 11th Edition added flexibility for setting urban speed limits by roadway context rather than 85th-percentile speed alone.
  • A regulatory sign is enforceable only when installed by the authority with jurisdiction over that road.
Source: Manual on Uniform Traffic Control Devices, 11th Edition (Federal Highway Administration, December 2023, public domain) — read the full manual at mutcd.fhwa.dot.gov. Your state may still be operating under the 2009 edition or a state supplement — for state construction specs, see the DOT specifications library.
Sign Placement →Warning Signs →Work Zones →