Closing of a Lane and Simulation of Speed limits

 
In this scenario you can simulate an open system with a lane closing (e.g., due to road works) at the position of the white squares. You can observe the remarkably positive effect of a more homogeneous vehicle population introduced by a speed limit. So, "unfortunately", speed limits may be useful, but only, if Otherwise,a local speed limit can act as the bottleneck and provoque breakdowns by itself!