Some US cities came after the car, but anything on the eastern side existed well before cars. Those cities had walkable neighbourhoods, dense downtowns and public transit. A lot of that was bulldozed to make the roads wider and provide parking for the car. North American cities were not built for the car, they were bulldozed for it.

American cities were designed before cars as well. The difference is that the car and fossil fuel industries lobbied for cities to be completely redesigned around cars in the 50s and 60s. And governments all across the US bulldozed their own cities to do it.

Maybe we could connect many cars together on this system, and make it so the front or the back car is a special one thats more powerful and pulls the other cars behind or pushes the ones in front of it that carries all the passengers. For convenience, we could make nice loading and unloading areas.

An important source of plastics is road traffic emissions. Kole et al. reported global average emissions of tyre wear particles (TWPs) of 0.81 kg year−1 per capita, about 6.1 million tonnes (~1.8% of total plastic production). Emissions of brake wear particles (BWPs) add another 0.5 million tonnes. TWPs and BWPs are produced via mechanical abrasion and corrosion.

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Most car braking systems consist of a disc or drum with either a pair of shoes or pads mounted in callipers. Brake linings consist of binders, fibres, fillers, frictional additives or lubricants and abrasives. Thus, BWPs are a complicated mixture of metal and plastic. BWP emissions depend on the bulk friction material on the frequency and severity of braking speed, weight, condition and maintenance of the automobile and the environmental conditions.

From this article.