CASE STUDY: Northern California US 199-Del Norte County

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Over the last decade, a horizontal curve within the parks’ limits experienced a high frequency of wet crashes. This curve is located on US 199, a two-lane, rural highway in Del Norte County, approximately one mile east of the South Fork Road intersection. 

CASE STUDY: Bellevue, Washington Downgrade Intersection Approach

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The Forest Drive westbound approach, at its intersection with Cole Creek Parkway, regularly had vehicles sliding down the hill during icy weather. In 2011, the average daily traffic at the approach was 4,941 vehicles. In an effort to combat the problem, a High Friction Surface treatment was applied on this approach in 2004.