Not necessarily. It depends on who hit you from the back. As far as i am aware, there is 2 sort of people whom despite hitting you from the back, you won't be able to claim their insurance.
1. Malay 2. City Liner
As much as it sadden me, if you are a chinese and got hit by a malay, there is a
very high probability when reporting time they will twist the fact and say you are at wrong, even if you are the one being hit from the back. I was personally involved in such case, and so is a few friends, whom all share the same fate.
Second is public transport company like City Liner. Again, you will never be able to claim their insurance, because the report will never be done, officer in charge will always be magically away despite appointment is being made and confirmed a million times to settle the case. Same thing, it happened to me, my bro and some friends.
So to me, if i get hit by these people, i insist on the spot settlement if i can. Else once you reach the police station, it is always you are at fault despite you being hit.

wow..speechless...