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11th edition of the MUTCD, published December 2023. In the United States, road signs are, for the most part, standardized by federal regulations, most notably in the Manual on Uniform Traffic Control Devices (MUTCD) and its companion volume the Standard Highway Signs (SHS).
An emergency detour route (EDR) sign on Ontario Highway 401. The province of Ontario in Canada is one jurisdiction outside the United States with a very prevalent system of these roads. The Emergency Detour Routes, originally Emergency Diversion Routes (EDR), are a system of temporary detour routes paralleling many major highways in Ontario.
These signs indicate when a multilane highway is being narrowed, when a passing lane is ending, or where the road is widening or a passing lane starting. Another type of sign is used to indicate central "two-way" left turning lane in center of roadway. Warning signs may also warn of "Highway ends", where the road changes class or type.
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Traffic signs or road signs are signs erected at the side of or above roads to give instructions or provide information to road users. The earliest signs were simple wooden or stone milestones . Later, signs with directional arms were introduced, for example the fingerposts in the United Kingdom and their wooden counterparts in Saxony .
Sign for the A2 road. Road signs in Botswana are based on the SADC Road Traffic Signs Manual, [1] [2] [3] a document designed to harmonise traffic signs in member states of the Southern Africa Development Community. A white background signifies the sign is permanent, while a yellow background signifies that the sign is temporary.