Yeah I normally do the 1 car rule too, and it pisses me off if I'm on a slip lane and people try to not let me out (I say try to 'cos I can normally bully then back!

)
I realised that first post did may have made me sound a bit of a dick that never lets people out - that's not the case, I promise! It's kinda weird the way the roas there works and difficult to explain, normally I'm a very nice and polite driver! Just not when people try to force there way infront of me!