A half mile is plenty of time to prepare drivers for a closed shoulder. Sign gives specific distance as to when the shoulder will be closing. Durable engineer grade aluminum sign outlasts the competition.
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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