i have no idea what happened in this particular case. but it seems that if you're an arab in israel and you get into a car accident where you hit pedestrians, you will be summarily executed at the scene, the government may demolish your family's house, and the ultra-orthodox will run around beating random arabs they find on the street.
again, i do not know if today's incident was really a terrorist attack or just a tragic traffic accident. there have been at least two recent incidents where pedestrians were intentionally run over by a palestinian driver in israel. but by killing the driver at the scene, israeli police have probably ruined the only real way of telling the difference. and this could have just been an accident. now we'll probably never know for sure.