They used to say that about jogging - knees, ankles, all the joints really, getting pounded. And it's true. Bicycling is *mostly* low-impact, and great exercise, too, though I do it out of necessity and for fun. It's only six miles round trip home to work to home.
Sometimes I'll take an extended jaunt on weekends to the parks here, or I'll just aimlessly explore. Usually only 15-20 miles but in a busy city like Houston one cannot always take a 'quiet' route i.e. backroads/subdivisions. There are a few "bike path" and shared thingies, but it's still not very bike "friendly". Our current mayor is a cyclist, though, and he has encouraged a lot of new and future plans. But some (car)drivers are going to be either hostile/indifferent/stupid anyhow. Sigh. It's so much fun though, that I don't mind the scars. And as mentioned by wiser persons, they "add character".
The best cheesecake I found here is made at a French bakery. It's "euro" style, but of course! , and is light years away from what I call "ice box" or "New York" kind (though that's good in it's own manner). Quite pricey too - sacre bleu! - but worth it. I get a whole cake and share with others, usually eat two slices and feel tremendously guilty, like I've just had sex in public or something. They make a dark chocolate covered one that's almost too good for words. In fact, it is. Indescribably delicious. And good for you, too! .....ummm, well, not really. But I burn those cals off with the rush and a few miles on the ride. They have wonderful bread, too, and killer croissants. Sometimes I'm able to resist temptation and just leave with a loaf of bread. Sometimes, not often.
I like the sign idea, though yeah, could trigger an altercation. I wear loud socks and shirts so people can see me, also have flashing LED lights at night, front and back, reflector strips on frame/pedals, and still have more idiot drivers that either cut me off or jump right in front of me. Then they express surprise/dismay /hostility sometimes. I've yet to hit a car or be hit by one, had a few close calls. I've hit the pavement several times though, usually road conditions or bad judgement on my part. Cycling is so much fun that's it's worth the risks, to me. It'd be nice if I didn't crash so often, but usually it's no biggie.
Rick " top speed? around 45mph on a flat, smooth road " Jones