BOSS Area Map
Project Map

BOSS Area Map (1mb)

BOSS Fast Facts

Service Areas:

  • Durham County service began in July 2012.
  • Activating on I-40 in Wake County in August 2013.

Service Restrictions:

  • Used at the driver’s discretion only when traffic slows to less than 35 MPH.
  • Buses may travel no faster than 35 MPH when in shoulder.


  • Approximately $2,000 per shoulder mile including signage.
Links and BOSS Documents
Bus On Shoulder System (BOSS) billboard

In partnership with local public transportation systems, the N.C. Department of Transportation's Bus On Shoulder System, also known as BOSS, helps keep buses on time, provides more reliable service and encourages the use of public transportation, which reduces traffic congestion on North Carolina roads.

BOSS offers immediate benefits during times of moderate or heavy traffic congestion. It is not limited to rush-hour congestion; bus drivers can move to the shoulder at any time during major traffic backups.

BOSS in Use

Since August 2013, BOSS has been used along both directions of Interstate 40 from U.S. 15-501 in Durham County to Wade Avenue in Wake County. BOSS also continues on Wade Avenue between I-40 and Blue Ridge Road.

BOSS is in use on the following GoTriangle routes in Durham County:

  • Chapel Hill Express (CRX)
  • Route 800 – Chapel Hill to the Regional Transit Center via The Streets at Southpoint
  • Route 700 – Durham to the Regional Transit Center (eastbound only on I-40)
  • Shuttle 42 between the Regional Transit Center and IBM (eastbound only on I-40)

BOSS is in use on the following GoTriangle routes in Wake County:

  • Route 100 – Downtown Raleigh to Raleigh-Durham International Airport to the Regional Transit Center
  • Route 105 – Downtown Raleigh to the Regional Transit Center
  • Route 301 – Downtown Raleigh to Cary to the Regional Transit Center
  • Chapel Hill Express (CRX)
  • Durham-Raleigh Express (DRX)

How BOSS Works

When traffic is moving at speeds below 35 mph, BOSS allows trained public transportation bus drivers to travel at low speeds on designated interstate and primary route shoulders.

  • Buses traveling on shoulders can travel no more than 15 mph faster than traffic – and at a maximum speed of 35 mph.
  • Buses operating on the shoulder must yield to emergency response vehicles as well as any other vehicles parked in the shoulder. To help keep the shoulders clear, unattended vehicles in the shoulders of designated BOSS routes are towed as quickly as possible.
  • Although traffic might be moving at speeds slower than 35 mph, it is up to the trained bus driver to determine whether conditions are safe to travel in the shoulder.
Maximum BOSS operating speeds
Travel Speeds in Main LanesMaximum Bus Speeds in Shoulder
Above 35 mphBuses may not travel on shoulder
20 to 35 mph35 mph (maximum speed in shoulder)
15 mph30 mph (i.e., 15 mph above main lanes)
5 mph20 mph (i.e., 15 mph above main lanes)
Stopped (0 mph)15 mph (i.e., 15 mph above main lanes)

Contact Information

Meredith McDiarmid, PE, CPM
State Systems Operations Engineer
NCDOT Traffic Systems Operations Unit

Send a message
(919) 825-2619
1636 Gold Star Drive
Raleigh, N.C. 27607