I'm always concious or try to keep an eyes out who's behind me and leave a large gap in the front.
I almost had an encounter with a 4WD towing a boat a while back on Para Rd, in the stop and go traffic jam. The driver zoned out and before you know it, I heard screetching sound from behind me, looked back and saw smoke and big 4WD coming at me. Luckily, I stepped on the gas and moved forward to get out of the way and avoided the unplesantness.
So yeah,
always checking rear view mirror
always leave a large gap to the car in front of you
always have the car in 1st gear when stopped at the traffic light........just in case