I have a routing problem where I want a set of waypoints to be done one after another without anything in between as long as one has been started in the set. For example: Waypoints (A, B, C, D, E) A, C, E must be done together as long as one is started Which gives us: The driver goes to B, then A, then they must do C and E so (B, A, C, E, D) or (B, A, E, C, D) but (B, A, D, E, C) is wrong. I would have wanted to use something like OnlyEnforceIf for a constraint but I can see it does not work with the routing solver. Does anyone have an idea of a solution? I assume I need conditional constraints but cannot work out a way of doing it. Continue reading...