Work Zone Mobility and Safety Program
Photo collage: temporary lane closure, road marking installation, cone with mounted warning light, and drum separated work zones.
Office of Operations 21st Century Operations Using 21st Century Technologies

Best Practice

BEST PRACTICE:

A6−4: Policy/Standards for Slow Moving or Mobile Maintenance Operations

DESCRIPTION:

The North Carolina Department of Transportation (NCDOT) developed definitions and separate standard drawings for traffic control set−up for moving and mobile operations. NCDOT's Maintenance & Utility Traffic Control Guidelines define moving operations as faster than 3 mph (e.g., striping), and mobile operations as work that moves intermittently or is stopped for up to 15 minutes (e.g., pothole patching). According to the policy, the designer first must determine if the operation is moving or mobile, and then must get approval from a Qualified Work Zone Supervisor before using any of the drawings provided in the MUTG. NCDOT's Guidelines can be found at: https://connect.ncdot.gov/projects/wztc/Documents/NCDOT_Maint_Utility_TC_Guidelines.pdf.

REASON(S) FOR ADOPTING:

After discovering that an increase in volume and speed along high−speed/high volume highways led to an increase in collisions between motorists and maintenance vehicles, the new standards were introduced. Having policies can lead to better coordinated efforts for this type of operation and a decrease in collisions between motorists and workers.

PRIMARY BENEFIT(S):

North Carolina has experienced a significant reduction in serious collisions between motorists and maintenance vehicles since the introduction of its policy and standard drawings for moving operations. In Indiana, having the mobile operations section in its handbook has led to improved coordination and implementation of mobile operations activities across the State.

MOST APPLICABLE LOCATION(S)/PROJECT(S):

This procedure applies to all routes where a slow moving or mobile maintenance operation occurs.

STATE(S) WHERE USED:

Indiana, North Carolina

SOURCE/CONTACT(S):

Gail Lee, Indiana DOT
Phone: (317) 232−5208
E−mail: GLEE@indot.in.gov

Stuart Bourne
North Carolina DOT
Phone: (919) 250−4151
E−mail: sbourne@dot.state.nc.us

Bradley Hibbs
FHWA North Carolina Division Office
Phone: (919) 747−7006
E−mail: bradley.hibbs@dot.gov

Office of Operations