Rather an unwise manoeuvre by the car driver but there are normally three nearside mirrors on the truck so he probably could have checked a little better. He should have picked the car up when it first entered his nearside.
It's also extremely annoying when cruising at the trucks maximum 56mph & cars overtake you also on cruise but only a mile or two an hour faster. Just put your foot down a bit & get past, you never know what could happen.
