Vehicle collisions between players aren't respecting the dedicated server's "No Killing" setting. At most, the vehicle should be damaged or destroyed but not kill the player.
Me and 3 other friends on 2.0 Experimental found that while allied on a no pvp server can unalive each other while we are our vehicles. This bug is working for all vehicles and found this by just randomly doing fun things.
This is major and has been verified for all vehicles. Players take the damage in place of their vehicles and can be unalived without notice and from anyone as the game does not say who was doing the shooting.