are the partitions that separate the lanes bulletproof?If they are not I better be care of who is shooting next to me.

Not necessarily.  I've seen bullet holes through quite a few.

I would be suprised if they are bullet proof.  Granted, I have never seen any with holes in them, but I think that they are much more to keep brass from deflecting too far and to mark the lanes than anything else.

ETA:  Regardless of the type of range and whether there is bulletproof glass, I think that it would always be a good idea to be careful who you are shooting next to.  Some of the worst safety problems I have seen didn't necessarily occur at the actual shooting lanes.  They were in the area behind the lanes when people would muzzle sweep everyone casing/uncasing guns, unholstering a gun, or just showing off their/playing with their gun.

No bullet protection as far as I have ever heard.

I've seen plenty with bullet holes around here.  

The ones I've seen sure don't look bullet-proof.

I believe the ones at my range, the NRA HQ range, are. But I don't think most ranges have that.

Apparently, they are bullet-proof at our public club. Several with bullet impacts, but no through-penetration. The club staff claims they are rated for .308 rifle impact, but have no idea whether that is valid. The staff also claims they are very expensive--several thou each, and they bill the shooter for partician replacement. Guess your home-owners insurance might cover that.