Standard: 01 The ONE LANE ROAD (W20-4) sign shall be used only in advance of that point where motor vehicle traffic in both directions must use a common single lane (see Section 6C.10). It shall have the legend ONE LANE ROAD, XX FEET, XX MILES, or AHEAD.
With the transformation of the two lane road into one, accidents become more likely. Make the transition smoother with a proper warning before half a mile. Signs work.
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