No it does not work correctly.  Car navigation:  

https://www.openstreetmap.org/directions?engine=fossgis_osrm_car&route=50.779064%2C6.082735%3B50.780469%2C6.079913#map=18/50.779780/6.081335

https://www.openstreetmap.org/directions?engine=fossgis_valhalla_car&route=50.779064%2C6.082735%3B50.780469%2C6.079913

These car rides are impossible.