The shoulder of a road is a necessary "safe" place for stalled cars and vehicular emergencies. Inform drivers that the left shoulder closes with a safety sign.
Standard: 01 The Shoulder Work sign shall have the legend SHOULDER WORK (W21-5), RIGHT (LEFT) SHOULDER CLOSED (W21-5a), or RIGHT (LEFT) SHOULDER CLOSED XX FT or AHEAD (W21-5b).
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