Hello Ken,
I think that here in the "colonies" we just randomly rejected stuff that came from the UK out of spite (hangover from the Revolution and all). In Europe dates are in Day-Month-Year, and we do it backwards because it has always been so, although we have mellowed through the generations and decipher the alternatives anyway.
Driving on the Right or Left I think was the result of some Auto manufacturer trying to avoid stepping on someone else's Patent (?) but it does make sense to pass oncoming traffic on the side you are sitting on, as the natural tendency is to keep your head as far away from the point of impact as possible. When driving on narrow un-lined roads fewer collisions are a good thing.... so why do we still kill so many on the highways annually? Even though there are four or more lanes divided and all going the same direction?
Here in the States, there are a few "Traffic Circles" (Roundabouts), mostly in the Eastern States, but there are a few cropping up here in the West also. Supposedly to improve the flow of traffic.... more of a "bottleneck" actually. Mine is a University town and we have a large Foreign Student Population, so at least some drivers get around them easily..... the majority are clueless and have trouble getting in and out without threatening life and property (mostly the natives). I'm thinking that is is cheaper to sweep up broken glass than install traffic lights.
Then again, while I'm on a rant here.... We will let anyone drive it seems! last time I was down at the Department Of Motor Vehicles to renew my license, there were a couple of fellows at the counter next to me explaining to the clerk that "I must go with my friend to take the written part of the test to translate the questions.". Oh Yeah, we will even let folks loose on the streets who cannot even READ the Road Signs! Only In America!!
Now on the money thing... Pound Sterling was the value of a pound of Silver, and the note was supported by reserves of the metal. The American Dollar is supported by reserves of Gold. We however had a bunch of Silver in the ground, and when the value of Silver on the American market dropped to around two cents an ounce, President Roosevelt ordered the Silver mines closed and backfilled. For awhile there were Dollars backed by Silver Reserves and marked "Silver Certificate". A large number of the old Silver Mines have never been reopened, because the costs of resuming operations exceeded the value of the metal therein. Gold is still the International standard of commerce, but the metal never moves around.... only the paper representing it.
Hope that was all "clearer than mud".
Take Care and Rest Easy;
Doug