Due to crashes at a railroad crossing in Salem, Oregon, an overpass (with a roadway surface 26 ft above the existing road) is to be constructed on an existing level highway. The existing highway has a design speed of 50 mi/h. The overpass structure is to be level, centered above the railroad, and 180 ft long. What length of the existing level highway must be reconstructed to provide an appropriate vertical alignment

Oregon had 19 railroad crossing accidents in 2018, up from 10 in 2013. Marion County has more than most counties, logging 28 since 2008.

Explanation:

It provides explicit guidance to improve railroad crossing safety to support ODOT’s mission of a safe and efficient transporta-tion network, but is not a policy plan. Rather, it is an action plan to help ODOT achieve greater railroad crossing safety.

do you have any options?