Graphhopper wendet überigens an der Ampel:

https://www.openstreetmap.org/directions?engine=graphhopper_car&route=52.29926%2C8.10837%3B52.29948%2C8.10882#map=18/52.29929/8.11123&layers=N

OSRM macht völlig unglaubliches Zeugs:

https://www.openstreetmap.org/directions?engine=fossgis_osrm_car&route=52.29926%2C8.10837%3B52.29948%2C8.10882#map=17/52.30029/8.11255&layers=N