When I map the route, Leurville, where they were found, appears to be the end point of the toll roads from the Netherlands, where they would head onto a less busy road to continue on to their home.
However, the vehicle ending up in a - presumably -remote creek, their being found apart, and apparently no phone to call for help: seem at odds with a simple getting lost scenario.
However, the vehicle ending up in a - presumably -remote creek, their being found apart, and apparently no phone to call for help: seem at odds with a simple getting lost scenario.