This study has been conducted in order to develop a method to determine in which situations and under which circumstances unbundling (i.e. the separation of traffic flows), can be used to solve bottlenecks on motorways. Although unbundling has already been applied in the Netherlands, success of this method has been varying. In this study unbundling is understood as separation of through and local traffic on motorways by a physical separated main carriageway and parallel road. The circumstances under which the alternatives have been tested are six different distributions of through and local traffic, and the (total) traffic demand (the simulations are executed for a 10% and 20% increase of the initial determined demand). Unbundling of traffic flows can be considered a potential solution in solving bottlenecks on motorways, but to a limited extend. The unbundling measure can only be deemed societally beneficial for one alternative tested in this study.