Furthermore, signs should be installed on both sides of the traveled way on multi-lane divided highways. 35įor all highways in Washington State, signs for both directions of travel should be located opposite one another at speed zone boundaries. It is important to note the location of other traffic control devices in the segment and coordinate Speed Limit signs with them effectively. It is often desirable to begin and end a speed zone to encompass an important road intersection or driveway of a major generator like schools or residential developments. The preferred location for the beginning and ending points of speed zones is where there are definite changes in the character of the roadside development, like rural and urban boundaries. The third example shows a round sign with red outline that says "40" from Europe/Australia/United Kingdom.)įigure 3. International Speed Limit Signs. The second example shows a rectangular sign that says "Maximum 50" from Canada. This figure shows three speed sign examples, from left to right: The first example shows a rectagular sign that says "Speed Limit 50" from the United States. 15 In rural areas, on two-lane highways, Washington State recommends locating Speed Limit signs at 10 to 20 mile (16 to 32 km) intervals. Speed Limit signs indicating the statutory speed limits shall be installed at entrances to the State and at jurisdictional boundaries of metropolitan areas. Additional Speed Limit signs shall be installed beyond major intersections, downstream of egresses from major traffic generators, and at other locations where it is necessary to remind road users of the speed limit that is applicable. At the end of the section to which a speed limit applies, a Speed Limit sign showing the next speed limit shall be installed. Speed Limit (R2-1) signs, indicating speed limits for which posting is required by law, shall be located at the points of change from one speed limit to another. Section 2A of the MUTCD discusses standardization of location, mounting height, lateral offset, orientation, posts, and mountings. 33 The MUTCD states that the speed limits shown shall be in multiples of 5 mph (8 km/h). In general, Standard Highway Signs states that signs for regulatory speed zones shall be of the appropriate design-including size, text, and color. The MUTCD contains Standards, Guidance, and Options for the signing, and general guidelines to follow for the design and layout of the signs are contained in Standard Highway Signs. The general guidelines show different standard sizes depending on the type of highway or facility where the sign is intended to be. In North America, the latest editions of the MUTCD and Standard Highway Signs 33 should be referenced when developing signing for speed zones. Typical maximum Speed Limit signs are shown in Figure 3. Speed Limit signs must be correctly posted to ensure a speed limit is enforceable and to encourage compliance.
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