Just browsed the thread, so maybe someone mentioned this, but your seat mount is backwards. The bolt should be behind the post. You did do a fine job on it, though. Sweet Varsity!

"they get enrage for having to be delayed by 10 seconds, how small minded"

That's an interesting view of it. Then there's also the fact that if they're having to come that close to you, you might not be riding responsibly. And are you going the speed limit for the roads you're riding? If it's not a neighborhood, and there isn't adequate room for you to ride without impeding traffic, on the road that was built for cars (might even be illegal for you to ride depending on the road), I think they would have every right to be a little upset at you tooling down the narrow high speed road on your 10mph bike. Especially considering if you accidentally do something when you're destracted or blow a tire, they could end up in prison for life for hitting you even if it's your fault (sorry, save that tirade for another time).

Just make sure you're being safe and considering everything. Even if they are in the wrong, and they're the ones wrongfully endangering you, you'll loose the fight against the speeding car every time, and you could end up with more than some scrapes and bruises. That's not a thread any of us want to read about.