I generally avoid busy roads, but when I am at a light I do enter the center of the lane. This is because one of the most common accidents that cyclists suffer

I generally avoid busy roads, but when I am at a light I do enter the center of the lane. This is because one of the most common accidents that cyclists suffer is the "right hook" where a right-turning car does not see you. I accelerate hard in that case and don't ever get the feeling I'm hassling anyone much.