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Ramp signals aren’t new, but they are new to Raleigh — and they’re coming in September to an I-540 ramp near you. Two engineers from the North Carolina Department of Transportation tell us why they’re excited to see them installed.
540 Ramp Signals Project Page – NCDOT
Ramp meters coming to I-540 in Raleigh next spring – News & Observer, August 19, 2016
U.S. Federal Highway Administration study of ramp metering
Useful FAQs about ramp meters from the California DOT
