Don't realize yes, but what if you have some ass clown hi-beaming even way before coming up your tail....? I know becoz I'm aware he's coming up behind me when I was about to give way... sometimes it's this kinda ppl who thinks they own the road that makes me wanna hit the brakes instead of giving way...

There's a f***ing polite way to let ppl know you wanna pass - right signaling...