'Mumble strips' – quieter than rumble strips – rolling out on MN roads

Author:
Updated:
Original:

Minnesota's transportation leaders are rolling out a project to replace rumble strips with "mumble strips."

You've got to hand it to the Department of Transportation (MnDOT), it's a catchy name,. But MnDOT says it's also a way of solving a problem that has been plaguing residents living near busy roads.

Earlier this year, we reported how MnDOT was looking into new ways of reducing the noise made when vehicles drove over rumble strips designed to stop them veering across the centerline, after a "significant number of complaints" from homeowners who could hear them more than 3,000 feet away.

And MnDOT believes it found the answer in "sinusoidal" rumble strips, which are said to reduce the external noise made when a vehicle comes into contact with them, yet still produces a "good amount" of noise and vibration that's needed to alert the driver.

Currently, 800 miles of Minnesota roads have the traditional rectangular rumble strips. The sinusoidal strips on the other hand are shaped in a "sine wave" pattern that helps reduce external sound.

Here's a comparison of the two:

https://www.youtube.com/watch?v=W3-uPGb1nmM

Installation underway

In a news release on Thursday, the transportation department said it will commence a $5.9 million project to install the mumble strips along the centerline on Highway 42 in southeast Minnesota, between Eyota and Plainview.

The move was made in response to "external noise concerns" and will see the road closed and detoured for a month while they're installed.

MnDOT is keen to push ahead with installing the strips in several spots across the state, having settled on a preferred design.

KSTP reported last week that MnDOT crews installed the new strips on Highway 22 near Kasota, having conducted numerous tests over the summer using different-sized vehicles traveling at different speeds.

For now, only the centerlines on Highways 22 and 42 will have the mumble strips, though KSTP notes there is talk of expanding this to shoulders in the future.

The presence of rumble strips on centerlines are estimated to reduce crossover crashes by 44 percent, according to MnDOT.

Next Up

police tape, crime scene

1 dead in stabbing, another dies in separate shooting in Minneapolis

One person has been arrested in connection to the shooting.

Gary Kubiak

Vikings offensive coordinator Gary Kubiak announces retirement

Kubiak wraps up a career that has spanned nearly four decades.

alphaMPD

Minneapolis police seeks public help finding missing woman

A 63-year-old woman has been missing since Tuesday

coronavirus testing

Don't want to talk to a contact tracer? MN debuts online option after positive test

The department says the survey will allow its staff to keep track of more cases at a faster pace

Family Dollar

Money Gal Coaching: 12 things you are wasting your money on

Kelly Blodgett started Money Gal Coaching after paying down nearly $50K in debt in 18 months.

police lights

Three teens charged in Minneapolis robberies

The incidents took place on Saturday in Minneapolis.

covid-19, coronavirus, ppe

Here is Minnesota's COVID-19 update for Thursday, January 21

It's the first time in exactly four months that Minnesota has had fewer than 100 COVID patients in intensive care.

icy roads, bad roads

Girl, 16, killed in crash with semi on icy Minnesota road

The crash happened in Dodge County around 8 a.m. Wednesday.

police lights

Road rage incident sees driver punch out man's window, punch him in face

The incident happened in Waite Park Wednesday morning.

Screen Shot 2019-10-11 at 7.01.24 AM

Minneapolis will recover $100K in costs connected to 2019 Trump rally

The Target Center operator said it'll pay the costs over three years.

Related