(KCCR) — The South Dakota Department of Transportation says starting Tuesday, rumble strips will be installed along the center line of select highways in central South Dakota. Surface Preparation Technologies of New Kingstown, Pennsylvania will grind sinusoidal centerline rumble strips, commonly known as mumble strips into the road surface then will install permanent pavement markings on the highways. The centerline will also be sawed and resealed prior to completion of the project. Highways to get the treatment include Highway 14 from the Blunt junction with Highway 83 to three miles east of Blunt; Highway 83 from Highway 14 north for 13 miles and Highway 18 from Mission west for 11-point-four miles. The contractor hopes to be done with the project weather permitting by mid-August. Traffic will be guided in the work zones by flaggers and pilot cars during working hours. Motorists should expect delays during the road work.