If there is a point on the road pointing to the possibility of reversal, it is ignored and the route goes by a different road. In the OSM will be identified as highvay:
turning_circle

Here's a link to the example of describing the problem:
http://osrm.at/2WX
A left turn is prohibited. The route is laid across the bridge. And you can take a right turn to the site (which is ignored), turn around, and get to your destination.