You also need to redesign streets around cars, widening them, and making the city less pedestrian friendly in the process. And the less people walk, the younger they die and the more health problems they have along the way. You see your visible problem but don't consider the more diffuse and less visible problems caused by the car subsidies you favour.
What do people with your condition in Paris or Rome do? Most of Europe isn't designed around cars the way the usa is.
And keep in mind, most cities in the USA weren't designed around cars. New York City got it's street plan in 1810. San Francisco did in 1839. Our cities were designed with walkers in mind. The car is invasive.
The only American cities where "it was designed for cars" is an excuse are those built largely after the 1940s, when cars (and air conditioning) became commonplace: LA, Phoenix, Tucson, San Diego, etc.
What do people with your condition in Paris or Rome do? Most of Europe isn't designed around cars the way the usa is.