Because "pedestrianizing" historical cities, ironically, destroys their historical character. Look at this street from the 1800s
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Or this photo of Amsterdam
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Generally, streets weren't made for walking before or after cars. They were made for vehicles first. Which was the horse carriage at one point, then tram, for a few years the bicycle too and the car now. Most urbanists are historically illiterate retard leftists and believe the car was the first device on wheels that roamed the streets and think that street design simply continuing the philosophy it had for centuries was caused by evil car companies. Like every single left wing policy, it's based on cock and balls and it ruins everything that it can possible touch.
The predecessors of private cars are what chiefly defined Indo-European culture and the civilizations they built and conquered, let alone the cities they created largely to be playgrounds for them. You were a loser destined to be eradicated or enslaved if you didn't have a fast-enough horse and chariot, let alone one at all. It's literally in every White man's genes to want to drive your Mustang flat-out across the plain during the day and retire in the evening to cruising around the city your ancestors built in your magnificent chariot. Cars infamously were initially touted as something that would save urbanism because they didn't shit everywhere and didn't smell anywhere near as bad
Not only in Britain do fences come up right up to the (narrow) rural road; I think this has been talked about before, but the "narrow streets" Jason idolizes aren't fun for anybody. Amsterdam-Centrum has a narrow lane and if you aren't using it there's not too much room for error before your bike sinks into watery depths. Japanese alleyways are the same way, get ready to hug the wall.
I believe his stroad video was one of the first he made and it very adequately explained something I'd been trying to for years. It kept me intrigued until his first video where he preached this. This was my first thought upon hearing him assert that this is a good idea
It doesn't matter if the speed limit is 5mph, let alone 20 which he still acts like is too fast (any speed in a car is too fast for him, really); Europe has reduced their stopping distances to
zero. It is literally impossible for this to be safer than what I can personally attest already results in tons of roadkill in his hometown and America's much wider and more open roads generally. I call complete bullshit on any "statistics" shoved down my throat by the demons in Western governments and their useful idiots on the matter. I know it never drops below freezing in northwestern Europe, but even without people slipping and sliding down their front porches and driveways, animals, autistic kids, runaway wheelchairs (handicap accessibility is notoriously bad in Europe and famously good in America; zer can be nein untermenschen in glorivs Evropa), runaway cars and anything else that could potentially not see or not stop is
going to be hit in this narrow of a space. This law might have changed recently and Google gives me nothing, but in Germany you are legally required to hit an animal that has run out in front of you if panic stopping would result in a car behind you crashing into you, which probably means they're aware that this is the case.
If America tried to do this, these same people would accurately claim they're just trying to kill more kids, animals and disabled people. They'd say the same about America lowering curbs and sidewalks so emergency vehicles can drive up on them to get around traffic which they would praise any other country on earth for adopting from Europe.
Regarding the proposed speed limit itself which would double your travel time, you'd also double your fuel consumption and the amount of pollutants you're spewing right into peoples faces and their homes. As with everything, it isn't about being safe or more environmentally friendly; it's about making things harder for people that aren't the ruling class who have all the time in the world to cruise around in their fancy cars bought with your money. It's that much more time they get to cuck you