All you want to do is get on the freeway. Then a seemingly superfluous traffic signal stops you. Do ramp meters work?


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Additional reading:
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“Ramp Metering: A Proven, Cost-Effective Operational Strategy—A Primer,” Federal Highway Administration
https://ops.fhwa.dot.gov/publications/fhwahop14020/sec1.htm

“Ramp Meters,” Wikipedia
https://en.wikipedia.org/wiki/Ramp_meter

“Cost Estimates for ITS Devices of the T-REX Project” Summary, US Dept. of Transportation, 11/2001
https://www.itskrs.its.dot.gov/its/benecost.nsf/ID/278509cbe71f063f85256db100458931?OpenDocument&Query=CApp

“The Minimum Yellow Timing for Ramp Meters,” Wang, Liu
https://www.sciencedirect.com/science/article/pii/S2046043016301009

“Case Studies of U.S. Freeway-to-Freeway Ramp and Mainline Metering and Suggested Policies for Washington State,” Jacobson, Landsman
http://onlinepubs.trb.org/Onlinepubs/trr/1994/1446/1446-008.pdf

“A Case for Freeway Mainline Metering,” Habobian
http://onlinepubs.trb.org/Onlinepubs/trr/1995/1494/1494-002.pdf

Road Guy Rob

Rob is a 12-year veteran public radio reporter and talk show producer. Other staffers at the station called him the "road guy" because he kept running off to cover all the transportation stories. Rob has degrees in Geography (BS, 2010) and Civil Engineering (MS, 2018).

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