[Question] Enforcing vehicle breaks at depots

[aravindsuresh93]

Im using the below code to set breaks to vehicles and this is working fine. But i wanna make sure that breaks are only taken in a depot, how do i do that?

node_visit_transit = [0] * routing.Size()
break_intervals = {}
for v in range(manager.GetNumberOfVehicles()):
    break_intervals[v] = [
        routing.solver().FixedDurationIntervalVar(
            data['vehicle_tw'][v][0], 
            data['vehicle_tw'][v][1], 
            30, 
            False,  
            f'Break-{v}')
    ]
    distance_dimension.SetBreakIntervalsOfVehicle(break_intervals[v], v, node_visit_transit)

Thank you

[aravindsuresh93]

I solved this by adding 0 slack to all locations except my depot location.

for location_idx, time_window in enumerate(data['time_windows']):
        if data['station_type'][location_idx] == "d":
            continue

        index = manager.NodeToIndex(location_idx)
        distance_dimension.CumulVar(index).SetRange(time_window[0], time_window[1])
        slack_var = distance_dimension.SlackVar(index)
        routing.solver().Add(slack_var == 0)
        routing.AddToAssignment(slack_var)

Thank you @Mizux, your comment in #3929 helped me solve this.