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"amazing fast" was still decades to fully replace horse and cart and longer for trams and the like and like I said, I'll likely be gone before it happens.
http://www.thecascadiacourier.com/2014/08/from-horses-to-cars-in-seattle.html
"In 1912, traffic counts in London, Paris and New York all showed that the car had overtaken the horse. A Seattle traffic count in 1915 quantified traffic going to West Seattle and showed that horses still held market share in delivery functions but were losing out to street cars and motor vehicles for hauling people. From 5 AM to midnight on that November day, 291 street cars carried 11,699 people, 692 automobiles carried 1,501 people and 203 motorized taxis carried 744 people. Just 155 horse-drawn vehicles carried 187 people."
By the 1920s motor vehicles had completely replaced horse drawn carriages on the roads of New York... By 1925 the price of a Model T had fallen to under $300--- from $850 in 1908 and $500 in 1915.
Keeping to NYC.. and electric cars.. It is curious to note that by 1899 the vast majority of all Taxi cabs were electric. At this time most cars on the road of NYC were electric-- steam had a larger market share at this time than gasoline. It was a double knockout of price (by 1915 an electric car cost as leat 3x a Model T) and range--- to use the emerging highways -- that eventually killed the electric car...
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http://ausbcomp.com/~bbott/cars/carhist.htm
As I said, decades.
I very much doubt it. It takes councils months to repair a simple pothole. Rolling out a new 'magic motorway' will take them decades.
"amazing fast" was still decades to fully replace horse and cart and longer for trams and the like and like I said, I'll likely be gone before it happens.