A nonlinear controller creating a homogeneous flow is designed for a traffic model given by partial differential equations. To be able to apply nonlinear control techniques, a co-moving coordinate frame is set up leading to a reduced model of stop-and-go waves. The controller stabilizing this model is re-transformed and simplified. Properties of the controlled system indicating global stability are confirmed by simulations. Finally, a two-point controller is defined, bridging the gap to speed limits.