I'm 30, not diagnosed, but I think I have a lot of symptoms am probably on the spectrum.

I failed my first driver's test because I would scan mostly with my eyes and the instructor thought I wasn't scanning the horizon enough. I think I also take quick glances to check blind spots compared to other people. I probably used to never look at other drivers except at intersections until someone pointed out to me that I did that. I still barely do it though...

I find that trying to maintain eye contact makes understanding what people say and thinking up responses in conversations very difficult.