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NCDOT installing new traffic 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 from 7 a.m. to 6 p.m. on Sunday, Nov. 4, weather permitting.

The 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.

Consolidated Power Inc. of Mooresville was awarded the $188,000 project. Its 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 location. 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. Additional signage warning motorists of slow or stopped traffic will also be installed

The contractor may close a lane on I-277 between 9 p.m. and 6 a.m. Monday through Friday, and two lanes may be closed after 11 p.m. on those weeknights. Lane closures are also possible on the weekends when traffic volumes will be lighter. The completion date for the project is Dec. 4.

For more information on the project, please contact the resident engineer at (704) 845-1151.

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