Yes, this one was licked in 1885. The problem is not something amenable to a startup company. It's a huge entrenched cultural preference for terribly inefficient vehicles and development patterns that go with them.
Bicycles are not an 80/20 solution, they're a 99% solution, with the appropriate kind of bicycle and accessories. You can haul all kinds of crap - construction equipment, children, appliances, etc. - with a bicycle.
There are many other kinds of bicycles that make them accessible to people with reduced mobility: tricycles, hand-cycles, electric assist. Further - active transportation also counts as exercise and physical therapy, even further reducing the number of people who end up with reduced mobility in the first place!
I don't really know what a startup could possibly do in this area that's not already being done by the dozens of active transportation advocacy organizations at every level of society.
Everyone in this thread keeps bringing up the same argument about these catagories: "The problem is not something amenable to a startup company."
Isn't that the point of these requests? To inspire new and innovative ways of addressing a small (or, a chance at a larger) piece of these huge problem spaces?
It doesn't matter if you don't think these are realistic requests. YC is just trying put out an image that it wants to invest in historically "hard" market startups.
(As an aside, I'd say that bikes are not a 99% solution until the majority of people aren't afraid of riding them around cars.)
How do you deal with weather? It's certainly a lot more comfortable to drive somewhere in pouring rain than it is to bike, even when well prepared. And that preparation takes time and effort. Not to mention trying to bike in winter.
I really really hate cars, but I can see why people prefer them.
In cities I can imagine an apparatus not unlike a retractable roof in function, spanning the gaps between buildings. It would capture rainfall and prevent flooding while keeping citygoers dry. The "rooves" themselves would channel water as would an aqueduct, possibly reorienting themselves to better handle local downpours. The underside would need to emit light, whether transmitted natural light or otherwise.
Such a system would bring ancillary benefits of improving travel safety in the city, and reducing the need for road maintenance and vermin control (esp. mosquitoes).
I imagine the biggest technical challenge to be durabiity: The need to be resilient against hail, high winds and flying debris. And should it fail at the worst time ... an awful thought! But levees are a similar technology in that regard.
Bicycles are not an 80/20 solution, they're a 99% solution, with the appropriate kind of bicycle and accessories. You can haul all kinds of crap - construction equipment, children, appliances, etc. - with a bicycle.
There are many other kinds of bicycles that make them accessible to people with reduced mobility: tricycles, hand-cycles, electric assist. Further - active transportation also counts as exercise and physical therapy, even further reducing the number of people who end up with reduced mobility in the first place!
I don't really know what a startup could possibly do in this area that's not already being done by the dozens of active transportation advocacy organizations at every level of society.