Extreme temperatures can cause the binding in the surface of the road to melt, making for a slippery surface.

WASHINGTON COUNTY DEPARTMENT OF LAND USE AND TRANSPORTATION - When temperatures rise above 95 degrees for multiple consecutive days, roads can begin to bleed.Drivers should be on the lookout for slippery conditions due to expected record-setting temperatures this week, according to a release from the Washington County Department of Land Use and Transportation.

The phenomenon is known as "pavement bleeding" and happens during prolonged periods of extreme heat, which can cause the binding in road surfaces to come unglued. Keith Lewis, the county's Land Use and Transportation operations superintendent, said pavement bleeding can begin to appear when temperatures rise above 95 degrees for several consecutive days.

"If we have three to four days of extreme heat, we start to watch for it," Lewis said.

The amount of direct sunlight exposure, percentage of oil in the road surface, the type of traffic on the road and the amount of radiant heat the road surface holds after the sun goes down can all play a role in the likelihood of pavement bleeding, according to the release.

County road crews can combat slick conditions by applying sand.

To report hazardous road conditions during normal business hours (8 a.m.-5 p.m. Monday-Friday) call 503-846-ROAD (846-7623), e-mail or submit an online service request. Outside of normal business hours, call Washington County non-emergency at 503-629-0111.

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