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The Manual on Uniform Traffic Control Devices for Streets and Highways (usually referred to as the Manual on Uniform Traffic Control Devices, abbreviated MUTCD) is a document issued by the Federal Highway Administration (FHWA) of the United States Department of Transportation (USDOT) to specify the standards by which traffic signs, road surface markings, and signals are designed, installed ...
The CA MUTCD and sign specifications are organized similarly to the MUTCD and SHSM, respectively. Each of the California sign specifications is assigned an alphanumeric designation and organized according to the same series found in the SHSM. The sign designation for a state-specific sign includes a "(CA)" after the sign number.
A 1965 law strengthened the MUTCD's legal authority by prohibiting the sale, purchase, or manufacture of noncompliant signs and signals. [4] Further editions were published in 2003, 2005, and 2012 under a shortened title, Ohio Manual of Uniform Traffic Control Devices. The 2012 edition conforms to the 2009 MUTCD. [3]
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official MUTCD EPS converted to SVG: 21:00, 5 April 2009: 232 × 288 (5 KB) Overpush~commonswiki: MUTCD R2-1 speed limit sign Source: Page Page 5B-2, Manual on Uniform Traffic Control Devices for Streets and Highways - 2003 Edition
The rate of taper is 1:20 on diameter, in other words 0.600" on diameter per foot, .050" on diameter per inch. Tapers range from a Number 2 to a Number 20. The diameter of the big end in inches is always the taper size divided by 8, the small end is always the taper size divided by 10 and the length is the taper size divided by 2.
SVG file size reduced, then adjusted orange color (#dd7500) on road signs (uploaded with Pywikibot, see here for details) 21:23, 6 October 2012: 72 × 58 (6 KB) Fry1989: User created page with UploadWizard
The taper rate for all NPT threads is 1 inch of diameter in 16 inches of length (3 ⁄ 4 inch per foot or 62.5 millimeters per meter) measured by the change of diameter (of the pipe thread) over distance of thread. The half-angle (between the taper surface and the axis of the pipe) is arctan(1 ⁄ 32) ≈ 1.7899° ≈ 1° 47′.