I'll make sure that when I signal, I'm already on the same speed (or similar) to the car at the side, so that I'll immediately turn to the other lane. The other driver won't have the time to speed up to block my way... Of course, if for some reason, I can't turn in, I'll just wait until someone gives way.
So now my point is, most of the time, people change lanes to get to a faster lane. If you can't get into a lane for whatever reason, can't you just wait? :dunno:
And comparing the US to Singapore is kind of unfair. The max speed on the highway is 2x the max speed in SG, i don't think anyone would wanna make an error in judgment.