Leendert Kok

Dr. ir. A.L. Kok


Universiteit Twente
Postbus 217
7500 AE Enschede

Kamer: E110 (Capitool 15)
Tel: (053-489)4164
Fax: (053-489)2159

Leendert Kok is a PhD student at the University of Twente (Enschede). The research project he is working on is called: Vehicle routing under time-dependent travel times.

PhD research

Traffic congestion forms an increasing problem for companies like logistical service providers and distribution firms. It causes low delivery reliability and high transport costs. The travel times between customers do not only depend on the chosen routes, but also on the time of departure. We refer to such travel times as ‘time-dependent travel times’. In this research, we focus on the development of solution methods for the vehicle routing problem with time-dependent travel times. On top of that, we take into account realistic restrictions such as driving hours regulations. Finally, we focus on solution methods which can solve problem instances of realistic sizes within practical computation times.


Kok, A.L. (2006). Spatial Resource Constrained Project Scheduling, Master Thesis, University of Twente.

Hurink, J.L., Kok, A.L., Paulus, J.J. (2006). Decomposition Method for Project Scheduling with Spatial Resources, Beta Working Paper 181.

Kok, A.L., Hans, E.W., Schutten, J.M.J. (2007). Optimizing Departure Times in Vehicle Routes, Beta working paper 236.

Gromicho, J., van Hoorn, J.J., Kok, A.L., Schutten, J.M.J. (2008). Restricted dynamic programming: a flexible framework for solving realistic VRPs, Beta working paper 266.

Kok, A.L., Hans, E.W., Schutten, J.M.J. (2009). Vehicle routing under time-dependent travel times: the impact of congestion avoidance, Beta working paper 267.

Kok, A.L., Meyer, C.M., Kopfer, H., Schutten, J.M.J. (2009). Dynamic programming algorithm for the vehicle routing problem with time windows and EC social legislation, To appear in Transportation Science.

Meyer, C.M., Kopfer, H., Kok, A.L., Schutten, J.M.J. (2009). Distributed Decision Making in Combined Vehicle Routing and Break Scheduling, Beta working paper 271.

Meyer, C.M., Kok, A.L., Kopfer, H., Schutten, J.M.J. (2009). Analyzing combined vehicle routing and break scheduling from a distributed decision making perspective, Beta working paper 289.

Goel, A., Kok, A.L. (2009). Efficient Truck Driver Scheduling in the United States, submitted.

Goel, A., Kok, A.L. (2009). Efficient Scheduling of Team Truck Drivers in the European Union, submitted

Kok, A.L., Hans, E.W., Schutten, J.M.J., Zijm, W.H.M. (2010). Vehicle Routing with Traffic Congestion and Drivers' Driving and Working Rules, Beta working paper 305.