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A diagrammatic sign or diagrammatic guide sign is a type of guide sign that indicates destinations using a large, map-like illustration of the road layout. The term is most commonly associated with diagrammatic signs installed ahead of forks in controlled-access highways to indicate the destination of each lane.
Signs including Stop, Yield, No Turns, No Trucks, No Parking, No Stopping, Minimum Speed, Right Turn Only, Do Not Enter, Weight Limit, and Speed Limit are considered regulatory signs. Some have special shapes, such as the octagon for the Stop sign and the crossbuck for railroad crossings.
Signs in some parts of Canada and Mexico near the US border often include both metric and Imperial units, to remind US drivers that they are entering metric countries. In Canada, these signs display the imperial speed limit using a Canadian-style sign, rather than an MUTCD-standard used in the US. [8] No such equivalent exists in the US.
An interchange or a junction is a highway layout that permits traffic from one controlled-access highway to access another and vice versa, whereas an access point is a highway layout where traffic from a distributor or local road can join a controlled-access highway.
Road signs in Japan are either controlled by local police authorities under Road Traffic Law (道路交通法, Dōro Kōtsūhō) or by other road-controlling entities including Ministry of Land, Infrastructure, Transport and Tourism, local municipalities, NEXCO (companies controlling expressways), under Road Law (道路法, Dōrohō). Most of ...
Combined, they provide a three-dimensional layout for a roadway. The alignment is the route of the road, defined as a series of horizontal tangents and curves. The profile is the vertical aspect of the road, including crest and sag curves, and the straight grade lines connecting them.
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