A road network graph may need to be modified directly at the last minute due to traffic, accidents, or construction work. IloDispatcherGraph includes functionality to allow you to modify the network topology and costs by direct manipulation. The member function IloDispatcherGraph::forbidArcUse sets the cost of the arc to infinity. The member function IloDispatcherGraph::setTurnPenalty sets the penalty cost of turning from one arc to another along the dimension. In this example, the penalty for turning from arc 1323 to arc 1544 is 12 time units.

Add the following code after the comment
//Make last minute graph modifications

void RoutingModel::lastMinuteGraphChanges () {
  _graph.forbidArcUse(_graph.getArcByEnds(2785-1, 2785));
  _graph.forbidArcUse(_graph.getArcByEnds(2785+1, 2785));
  _graph.forbidArcUse(_graph.getArcByEnds(2785-56, 2785));
  _graph.setTurnPenalty(_graph.getArc(1323), _graph.getArc(1544), _time, 12);
}