1. Janssen WH Claessens FMM Muermans RC (1999) Vormgeving van duurzaam veilige wegcategorieën: evaluatie van ‘self-explaining’ kenmerken [Design of sustainably safe road categories: evaluation of ‘self-explaining’ characteristics] report TM-99-C016, TNO Technische Menskunde, Soesterberg, 1 June
2. Lu M van der Heijden R Wevers K (2003) Traffic safety – road infrastructure versus ITS Paper presented in Proceedings of the 10th World Congress on ITS, Madrid, November
3. TMC Forum (2004) Precise location referencing, TMC Forum Specification, Brussels, 20 September