>the best solution isn't to try to slow down the cars but rather to make mixed-use urban areas the default so that walking and biking become the norm.
hopefully you're not suggesting that cars should be travelling 50km/hr in mixed-use urban areas? Because "slowing down the cars" is a synonym for mixed-use area. That's the same thing, if you continue with car-only roads there's no need to slow down the cars.
hopefully you're not suggesting that cars should be travelling 50km/hr in mixed-use urban areas? Because "slowing down the cars" is a synonym for mixed-use area. That's the same thing, if you continue with car-only roads there's no need to slow down the cars.