I am trying to simulate communication among cars so I decided to use the veins project, but I want to be able to choose the routing protocol (an existing one, I am not trying to invent the wheel), and for the best of my knowledge the best way of doing it is by modifying the car.ned file in the veins projoct, unfortunately I don't know what should I change and how to modify it so there will be no errors.
It is realy important for and I would appreciate any help or explanation.