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Installing matrix riprap

Riprap Grout Protects Bridge Abutments

At a few test sites around the state, researchers have used a grout mixture to cement smaller, rounded rocks together at bridge abutments. Once applied to the rocks, the mixture forms what is called “matrix riprap," which is significantly stronger than conventional riprap. (read more) (Posted 7/14/2015)

More News

Major Ramp Metering Upgrade Reduces Freeway Delays

MnDOT reconfigured its ramp meter system to be more in sync with real conditions. As a result, Minnesotans are experiencing less delay on Twin Cities metro-area freeways. The new metering system is particularly effective at reducing the number of meters operating on light traffic days. (read more)
(Posted 4/27/2015)

Salt-Tolerant Sod and Seed Mixes Bring Greener Roadsides to Minnesota

For Minnesota’s roadside grasses, life isn’t easy. To survive, grass must be able to withstand extreme stresses including drought, heat, disease, soil compaction, poor quality soils, and high levels of road salt. (read more)
(Posted 4/9/2015)

Minnesota: Are You Ready to Mumble?

Rumble strips keep people safe, but the noise they produce can sometimes be a nuisance for residents. A new report finds that sinusoidal rumble strip designs — a.k.a. "mumble strips" — provide the same safety benefits to drivers while producing less external noise. (read more)
(Posted 3/16/2015)

MnDOT Tests Crowdsourcing to Improve Road Condition Reporting

The Minnesota Department of Transportation is testing a crowdsourcing application that will allow motorists to update winter weather road conditions on the state’s 511 system. (read more)
(Posted 3/9/2015)