Rik van Grol Rik is a Research Leader at Significance. He studied applied physics (PhD TU Delft, 1992) and was already closely involved in the development of transport models and dynamic traffic management during his studies. In 1994, he joined Hague Consulting Group, where he worked on and led a large number of projects in the field of dynamic traffic management and ITS. After the merger with RAND Europe in 2001, he was also active in the field of policy analysis and involved in projects on intermodal transport, uncertainty analysis, sustainable transport, and ICT. As co-founder of Significance, he is now mainly involved in enhancements of the Growth Model (GM) of the Dutch national transport model and coordinates LMS and NRM-related projects. He is also the author of the technical documentation and manual of the GM.