So, the instigator “looked down at his sat nav”... how long did he take his eyes off the road for to miss an upcoming red light and queuing traffic? His insurance company won’t be pleased with him, forking out for four damaged vehicles, plus PI claims... I don’t want to sound like I’m one of those ambulance-chasing tossers but keep an eye on your sore back and if it persists go and see your GP. Thank heavens that nobody was seriously hurt...