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{{multiple image
| align = right
| total_width = 200
| image1 = MUTCD W3-6.svg
| alt1 = A diamond-shaped with yellow background and black border, with the words "Draw Bridge"
| image2 = Vienna Convention road sign Ab-5-V1.svg
| alt2
| footer = The draw bridge warning sign (left) is one of the several signs under the MUTCD that remain{{when|date=January 2024}} text-only, while its equivalent under the Vienna Convention (right) displays a symbol of an open draw bridge.
}}
The U.S. adoption of several Vienna Convention-inspired symbol signs during the 1970s was a failure. For example, the lane drop symbol sign was criticized as baffling to U.S. drivers—who saw a "big milk bottle"—and therefore quite dangerous, since by definition it was supposed to be used in situations where drivers were about to run out of road and needed to merge into another lane immediately.<ref name="Conniff">{{cite news |last1 = Conniff |first1 = James C.G. |title = Danger: Signs Ahead |url = https://www.nytimes.com/1975/03/30/archives/danger-signs-ahead-misleading-highway-signs-raise-blood-pressure.html |access-date = August 19, 2020 |work = The New York Times |date = March 30, 1975 |page = 183 }}</ref> American highway safety experts ridiculed it as the "Rain Ahead" sign.<ref name="Conniff" /> Many American motorists were bewildered by the Vienna Convention's symbol sign with two children on it, requiring it to be supplemented with a "School Xing" plaque.<ref name="Hazlett">{{cite news |last1 = Hazlett |first1 = Bill |title = Some Confusing: Wordless Traffic Signs Popping Up |work = Los Angeles Times |date = March 23, 1972 |page = E1 }}</ref> (The American "School Xing" symbol was later redesigned to depict an adult crossing together with a child.) The 1971 MUTCD's preference for a rapid transition to symbols over words quietly disappeared in the 1978 MUTCD.<ref>{{cite book |last1 = American Association of State Highway Officials |last2 = National Joint Committee on Traffic Control Devices |title = Manual on Uniform Traffic Control Devices for Streets and Highways |date = 1978 |publisher = Federal Highway Administration |___location = Washington, DC |page = 2A-6 |chapter = Section 2A-13, Symbols }}</ref> The 2000 and 2003 MUTCDs each eliminated a symbol sign that had long been intended to replace a word message sign: "Pavement Ends" (in 2000) and "Narrow Bridge" (in 2003).<ref name="2003Rev1Intro">{{cite book |last1 = American Association of State Highway and Transportation Officials |last2 = National Joint Committee on Traffic Control Devices |title = Manual on Uniform Traffic Control Devices for Streets and Highways |date = 2003 |publisher = Federal Highway Administration |___location = Washington, DC |url = https://mutcd.fhwa.dot.gov/HTM/2003r1/intro/intro.htm |access-date = August 26, 2020 |chapter = Introduction }}</ref>
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== Other jurisdictions ==
{{multiple image
| align = right
| total_width = 200
| image1 = MUTCD R2-1.svg
| alt1 = A vertical rectangular white sign with a black border, with the words "SPEED LIMIT" above the number "50"
| image2 = Vienna Convention road sign C14-V1-50.svg
| alt2 = A circular white sign with a red border, with the number "50"
| footer = Under the MUTCD, the standard speed limit sign (left) used only in the United States includes the words "speed limit" above the number (which is in mph),<ref>{{cite book |title = Manual on Uniform Traffic Control Devices for Streets and Highways |date = 2009 |publisher = Federal Highway Administration |___location = Washington, DC |chapter-url = https://mutcd.fhwa.dot.gov/htm/2009r1r2/part2/fig2b_03_longdesc.htm |access-date = May 23, 2021 |chapter = Figure 2B-3. Speed Limit and Photo Enforcement Signs and Plaques }}</ref> while the standard one under the Vienna Convention (right) only requires the number which is used in most countries (which is mostly in km/h).<ref>{{cite book |title = Vienna Convention on Road Signs and Signals |edition = 2006 consolidated |publisher = United Nations Economic Commission for Europe |___location = Geneva, Switzerland |url = https://unece.org/DAM/trans/conventn/Conv_road_signs_2006v_EN.pdf |access-date = May 23, 2021 |pages = 41, 91 }}</ref>
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