I'm 6ft 230lbs, you can't miss me.
And I always get semi trucks and buses within inches of me every day. I ride with steel nerves, I expect it. I'm more surprised when I see the larger vehicles switch lanes to give me more room.
The speed limit on the roads I travel ranges from 45-50mph I wish I had 25mph roads.
Generally drivers who get too close run the red light if they see me coming up on them at an intersection and they know they pissed me off. The last thing they want is the big tattoo'd guy ripping them out of there car. If I do catch one at the light I just give them a dirty look and hope they open there mouth, so I can club there mirror off.