By Marlin Wolf Ulmer
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Additional resources for Approximate Dynamic Programming for Dynamic Vehicle Routing
For every new request, assignment and sequencing decisions have to be determined. , a hospital or a physiotherapy (Zhang et al. 2015b). Later, the customers are driven back to their homes. To match the customers’ appointments, dispatchers have to consider time windows (Ritzinger et al. 2014). Further, the customers have to return to their homes within the drivers’ working hours. Finally, vehicles can only transport a limited number of customers per time. To satisfy the time windows, dispatchers have to consider uncertain travel times within the city.
Application fields of service vehicle routing are emergency, maintenance, construction, repair, healthcare, and salesperson services. Service vehicles may be ambulances, police and fire brigades, healthcare, breakdown, technician, or repair vans. Considering a vehicle fleet, the service of a customer is usually not bound to a specific vehicle but can be reassigned if necessary. 2 Vehicle routing in practice Application Objective Costs Reliability Constraints Time Working Capacity windows hours Uncertainty Planning Travel Service Demands Requests time time Service Emergency Short Technician Medium Healthcare Medium Salesperson Medium Passenger transport Bus Long Dial a ride Short Patient transport Medium Shared mobility Short Goods transport Distribution Long Waste Long Retail Medium Grocery Medium Parcel delivery Long Parcel pickup Short Courier services Short Same-day delivery Short Responses to emergency calls have to be immediate (Schmid 2012).
In many cases, salespersons are not the clients’ top priority and they have to wait (Zhang et al. 2015a). The waiting time or service time respectively is therefore unknown and impacts future appointments. Salespersons may have to reschedule or skip planned appointments. 8 Transportation Vehicles The main purpose of transportation vehicles is to transport goods or passengers from one location to another. An extensive classification of real-world applications for transportation routing is provided by Coelho et al.