Minnesota Department of Transportation

511 Travel Info

Ramp Meters

What they are, why we have them and what we've learned

A ramp meter.


In 2001, MnDOT released the results of an independent study on ramp metering in the Twin Cities metro area, as mandated by the 2000 Legislature. 

The study evaluated the traffic flow and safety impacts associated with turning off all 430 ramp meters for six weeks. Read the May 13, 2002 final report.

Study Objectives

  • To fully explore the impacts of ramp metering on freeways, local roads, and on transit operations.
  • To identify the public perception of ramp metering.
  • To compare Minnesota's ramp metering system and timing strategies with other regional systems across the country.