Glad to know it's not just me (knowing where car ends). Yes, the Clarity is a big car and it took (a month or so into owning) trying to avoid an oncoming car's extended side mirror when crossing a very narrow bridge to realize how big. (yes, I did put a minor scratch on side of car from that incident). Still have trouble figuring out where the passenger side ends. The other day, parking against a stone curb, I scraped up the wheel rim. I think there's a thread on that--how soft the metal is and easy to damage. Scraping against a curb was never an issue with any other car we've had--you could rub a curb without damaging the wheels.
So...I'm much more concerned with gauging width than length of car. Though given how low the car is in the front, I'm extra careful pulling into a spot when curb or concrete bar in front looks high.