Minnesota Department of Transportation

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Sept. 29, 2023

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Hwy 91 seal coat project complete

WILLMAR, Minn. – A project to apply a chip seal coat to Highway 91 from Lake Wilson to Russell has been completed, according to the Minnesota Department of Transportation. The Highway 91 chip sealing project cost was approximately $988,000, and the contractor was Morris Seal Coat and Trucking, Inc.

About this project
Chip sealing, also referred to as a seal coat, is a type of paving material that mixes asphalt with pieces of gravel. A thin layer of liquid asphalt is sprayed on first followed by the placement of gravel. The gravel is compacted, and the excess stone is swept from the surface. Chip sealing protects the pavement, increases skid resistance, and extends the life of the road.

Driving on a chip sealed road
You can drive on a freshly chip sealed road after it has been swept. A chip seal looks different than regular pavement and a road that has been chip sealed will not be as quiet as a new pavement. The rough surface can also cause an increase in vibration for bicyclists. After a winter of plowing, the vehicle noise will diminish.

Chip sealing is an important preventative maintenance tool

  • Chip seals allow MnDOT the opportunity to preserve roads for a very low cost
  • Chip seals prevent deterioration of the pavement surface from the effects of aging and oxidation as a result of sun, water, traffic and plowing
  • Chip seals enhance safety by providing good skid resistance
  • In hot weather, chip seals re-seal cracks by flowing back together

More information
Learn more about chip sealing by watching this three-minute YouTube video.