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ATM Sign Testing Enters Next Phase Starting January 21 in Clark County

Post Date:01/17/2020 3:46 PM

CLARK COUNTY, NEV. – The Nevada Department of Transportation (NDOT) and the Regional Transportation Commission (RTC) of Southern Nevada will begin the next phase of Active Traffic Management (ATM) sign testing throughout the Las Vegas valley, starting January 21.

Forty-two ATM signs were installed along north and southbound Interstate 15 between Russell Road and Washington Avenue as well as along U.S. Highway 95 between Valley View and Las Vegas boulevards as part of the $1 billion Project NEON that finished in the summer of 2019. The full-color LED signs will provide next-generation, real-time driver information about detours, crashes, speed limit changes, and lane restrictions, thereby improving safety and traffic flows by reducing differential travel speeds and the likelihood of secondary crashes for enhanced operational efficiency.

Motorists, meanwhile, may notice different sign configurations during this testing phase, which is expected to stretch into March. Some of the noteworthy changes include enforceable speed limits posted to the right side with High Occupancy Vehicles (HOV) signage on the left. Also, motorists will note lane control arrows and X’s.  

What Motorists Need to Know

  • Variable speed limits (located on the right side of the sign structure) override the typical speed limit and are enforceable.
    • Why? The variable speed limit can be reduced or increased based on traffic flow, construction and roadway crashes, if needed, helping traffic flow smoothly through congested areas. These reduced speed limits are enforceable.
  • HOV signs (located to the left) can be changed and opened to general traffic under emergency conditions.
    • Why? It helps traffic flow around a crash or work zone. The HOV lane can be opened to general traffic to ease congestion. In this scenario, “Open to All” will be posted on the sign.
  • Lane control arrows and X’s (located across the top of the sign structure)
    • Why? Lane control signs will be activated when there is a crash or work zone activity; otherwise, they will remain dark.
    • Four different icons will be used to assist with lane control as described below:
      • If motorists need to proceed with caution, the yellow X with the word “Caution” will be posted.
      • If motorists need to prepare to merge due to a lane closing, the yellow X with the word “Merge” will be posted.
      • If the lane is closed to traffic, the red X and the word “Closed” will be posted.Once the motorist is beyond the crash or work zone, the lanes re-open and motorists will see the green arrow with the word “Open” above all lanes.

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