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The U.S. Department of Transportation's Federal Highway Administration Manual on Uniform Traffic Control Devices (MUDCD) does not indicate a regulation for the length of the lines but it does give this guide.

Guidance:

Broken lines should consist of 3 m (10 ft) line segments and 9 m (30 ft) gaps, or dimensions in a similar ratio of line segments to gaps as appropriate for traffic speeds and need for delineation. Option:

A dotted line for line extensions may consist of 0.6 m (2 ft) line segments and 0.6 m (2 ft) to 1.8 m (6 ft) gaps. A dotted line for lane drop/add markings may consist of 0.9 m (3 ft) line segments and 2.7 m (9 ft) gaps.

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โˆ™ 2009-01-27 05:39:59
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Q: How long are the white lines on the interstate highways?
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