Cars
they got cooler
mainly bikes and cars were very rare
See the attached link for some examples.
there is a lot of cool cars on are earth
Cool blue cars? if it is cool blue cars then yes it is legal
Cool cars often become even more cool when they are old. People remember the cars that were cool when they were teenagers. Later when they have more money, they may want to buy one. This makes old cool cars sometimes expensive collectors' items. Bad cars sometimes become cool when they are old, but usually not. Normal cars almost never become cool when they are old, except when they are so old that there are almost no cars from their era at all.
Big and heavy most were 6 passenger with plenty of chrome embellishments.
Never heard of any ad on self driving cars in the 50s.
There were several great cars in the 1950's. A few of the cars were the Jaguar XK120, Ford Thunderbird, MG MGA 1500, and Aston Martin DB4 GT Zagato.
no
All modern cars today are for the most part 12 volts DC. Some older cars from the 50s back were 6 volt.