I have come to a stop in Car 1 on a motorway due to a traffic jam ahead. Car 2 behind me comes to stop and is stationary behind me. Car 3 is behind Car 2 but I am unsure if he was stationary or not. Car 4 behind Car 3 was definitely moving and unable to stop, thus crashing into the back of Car 3 - due to this Car 3 was pushed forward into Car 2 and hence Car 2 was pushed forward into Car 1. Since I am in Car 1 and have not been pushed forward into a car in front of me and since I have damage to my the rear end of my vehicle from Car 2 who should I be sending my Letter of Demand to under Traffic Law?