What if speed of light was a 100Km/h only?🤔

 If the speed of light was, say, 100 km/h, we could experience the effects of special relativity in our day to day lives. Cars passing by would appear as pictures on a sheet of paper. Their headlights would be dark blue, perhaps even brightly violet, while their tail red lamps would be invisible. You could drive your car from New York to San Francisco in a matter of minutes, even though people there would have to wait over a week for you to arrive. On your way, you would see buildings, cities and mountains as thin features, bluish ahead and deep red in your rear mirror. Children could play in merry-go-rounds for years non stop, and would come out as if only minutes had elapsed.

Yeah, that'd be cool! But on the other hand, there would be drawback:

Airplanes couldn't fly faster than 100 km/h, it would take weeks to fly from America to Europe, and the trip would use such incredible amounts of fuel that no one but the most wealthy could afford it. Devices as simple as the phone would be unusable over any distance superior to a couple of blocks away; if you'd call a friend 50 km away, each bit of conversation would take 1 hour to get a response.

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