wouldn't reducing an 8-car lane into a 4-car lane just be worse with traffic? Even though there are fewer lanes, it doesn't mean that people would disappear. It would just up the traffic and accidents. And what if people don't have electric vehicles or bikes, then are they going to have to walk? What if somebody physically can't walk or bike and can't afford an electric car but want to go to Champs-Élysées?

Electric cars are not what they seem, They require huge amounts of cobalt, nickel, and lithium, way more than you think. It's a waste of resources and these machines producing lots of gasses leave GIGANTIC craters in the ground just to make ONE battery that lasts for 10-20 years. And millions of electric cars are sold throughout the world. It may seem like a green product, but it's like putting lipstick on a pig.

how is there going to be a traffic jam in the sky? You could just fly over other cars

Way less than that, I got this from an article, "Despite not being confirmed, it is estimated that the price could range between roughly 154,000 and 252,000 dollars. If confirmed, it would be a much lower figure compared to that of the most expensive car in the world, which is currently the Rolls-Royce Boat Tail (28 million dollars)."

There not going to do that. There is a feature where if the car starts to run out of energy, it will land; and maybe a solar charger so your not forever stranded. And plus you shouldn't travel long distances with it anyway.