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I-540 to get ramp signals for easy traffic flow on the highway
NCDOT to install ramp signals on parts of I-540
I-540 on-ramp signals become operational
I-540 ramp signals back on for day 2 after rough start
'On-Ramp' Signals Installed Along Westbound I-540
Introducing On-Ramp Signals in North Carolina
On-Ramp Signals in North Carolina
ADOT tests ramp meter timing on S.R. 51
Ramp signalling technology
New ramp metering system begins Monday on I-25
ITSGA | 2016.06 | Informational | GDOT Ramp Meters
DOT seeks public opinion on 540 toll road