skip to main
Close Menu

NCDOT installing new detection system on I-277 in Charlotte

Microwave Vehicle Detection Technology (MVD) will alert motorists to backups

CHARLOTTE -The N.C. Department of Transportation will begin installing an advanced warning system on the I-277 Outer Loop between Tryon Street and I-77 in Charlotte on Saturday, Oct. 20, weather permitting. This system will detect traffic data like volume and speed, alerting motorists to backups that frequently occur on the ramp from I-277 Outer to I-77 North.

Contractor Consolidated Power Inc. of Mooresville was awarded the $188,000 project. Crews will mill and replace the existing pavement markings on the Outer Loop between Graham Street and I-77 North, and will install the detection warning system, consisting of two Microwave Vehicle Detection (MVD) units and two flashing LED beacons.

The MVD units will collect traffic data and send it to a processor on site, where it will be analyzed. The result will be a message to activate one or both of the flashing beacons within the project. Once traffic reaches speeds below 20 miles an hour, the first beacon near the I-77 North exit ramp will activate. If traffic continues to back up toward Tryon Street, the second beacon will be activated. The contract also requires additional signage warning motorists of slow or stopped traffic.

During the project, the contractor may close a lane on I-277 from 9 p.m. to 6 a.m. Monday through Friday. Two lanes may be closed from 11 p.m. to 6 a.m. Monday through Friday. The contractor may also be permitted to close lanes on the weekends when traffic volumes will be lighter.

The completion date for the project is Nov. 4. For more information on the project, please contact the resident engineer at (704) 845-1151.

NCDOT operates other detection systems on N.C. 58 in Carteret County, on I-26 in Polk and Henderson Counties, and on I-40 in Iredell County.

NCDOT reminds motorists to watch signs for construction information, stay alert and obey the posted speed limit.

For real-time travel information at any time, call 511, visit or follow NCDOT on Twitter at Another option is NCDOT

Mobile, a phone-friendly version of the NCDOT website. To access it, type "" into the browser of your smartphone. Then, bookmark it to save for future reference. NCDOT Mobile is compatible with the iPhone, Android and some newer Blackberry phones.


2/15/2018 5:25 PM