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2/7/23, 2:46 PM Chapter 6H - MUTCD 2009 Edition - FHWA <br />https://mutcd.fhwa.dot.gov/htm/2009r1r2/part6/part6h.htm#table6H01 7/51 <br />Notes for Figure 6H-4—Typical Application 4 <br />Short Duration or Mobile Operation on a Shoulder <br />Guidance: <br />1. In those situations where multiple work locations within a limited distance make it practical to <br />place stationary signs, the distance between the advance warning sign and the work should not <br />exceed 5 miles. <br />2. In those situations where the distance between the advance signs and the work is 2 miles to 5 <br />miles, a Supplemental Distance plaque should be used with the ROAD WORK AHEAD sign. <br />Option: <br />3. The ROAD WORK NEXT XX MILES sign may be used instead of the ROAD WORK AHEAD sign if <br />the work locations occur over a distance of more than 2 miles. <br />4. Stationary warning signs may be omitted for short duration or mobile operations if the work <br />vehicle displays high-intensity rotating, flashing, oscillating, or strobe lights. <br />5. Vehicle hazard warning signals may be used to supplement high-intensity rotating, flashing, <br />oscillating, or strobe lights. <br />Standard: <br />6. Vehicle hazard warning signals shall not be used instead of the vehicle's high- <br />intensity rotating, flashing, oscillating, or strobe lights. <br />7. If an arrow board is used for an operation on the shoulder, the caution mode shall be <br />used. <br />8. Vehicle-mounted signs shall be mounted in a manner such that they are not obscured <br />by equipment or supplies. Sign legends on vehicle-mounted signs shall be covered or <br />turned from view when work is not in progress. <br />Figure 6H-4 Short-Duration or Mobile Operation on a Shoulder (TA-4)