Design and Evaluation of the TL-4 Minnesota Combination Traffic/Bicycle Bridge211 Rail

摘要

The Minnesota Department of Transportation as well as other highway departments211u001ehave been considering the accommodation of pedestrians and bicyclists along their 211u001eroadways and bridges. One area of particular concern are bridges with standard 211u001eheight rails. A standard height bridge rail, typically measuring 813mm in height, 211u001eis not capable of restraining a bicyclist during even a minor impact with the 211u001ebridge railing. To protect bicyclists, it is necessary to substantially increase 211u001ethe height of most TL-4 bridge rails. Since many existing railings have been 211u001eproven adequate for containing vehicular impacts, this rail height extension 211u001ecould be utilized on a number of different TL-4 barriers once testing has showed 211u001ethe extension to be crashworthy.