An AirBnB for travel
blog.rafaelcorrales.com
blog.rafaelcorrales.com
Also, I'm anticipating this could help for people in a pinch as well. I know I would have put up with just about anything to get a non-bus ride up to Boston!
Finally, there's insurance and taxi boards. The first can be handled (e.g. as a part of the booking process you buy a second policy covering the passenger or something like that), the second can't, and will kill this idea dead.
If I used this service and agreed to drive someone who did not show up for 15-20min I would be very annoyed and probably not use it again (even though I would be getting gas money).
Perhaps they can develop in some kind of rating to describe how punctual previous users have been. Then, I could write on their profile that they were late and other people would be aware of their tendencies before they agreed to give them a lift. This wouldn't work for first time users of the service though, since they would have no history...
Just a thought.
Of course, in places where there is no reasonable mass transit option, and for distances short enough to make flying too expensive or inconvenient (I'd rather drive from LA to SF than deal with flying, for example), it could possibly be a more efficient carpool creation tool. There are folks who make the same trip every week and hooking them up could be a useful endeavor, as well. In such a case, obviously, being on-time would be more important.
Maybe allowing selection of leisure or business travel would be a useful option.
Why not just run the site outside of the US? Who are the insurance companies and taxi boards going to come after? (A disclaimer like, "you may not use this site if you live in the US" could also be helpful for handling any lawsuits. Very much like Youtube is not liable if someone uploads child porn; their policy said not to do that, and it's your fault for doing it, not Google's.)
Taxi boards, sure, formally. Although, I've heard that the primary deterrent for running a pirate-taxi-service in Copenhagen Saturday night (that's ridiculously under-served by taxis, thanks to the taxi-board) is getting beaten up. The problem would be less for such a pre-arranged service, you'll look like you're picking up a friend, not soliciting, but it's still a bit of a risk to take, IMHO.
Don't get me wrong, I like the idea very much, I'm just a bit pessimistic on the systemic challenges.
(Car owner pays 25% of gas, guest pays 75%)
I enjoyed using AirBnB (as a host), though I was extremely selective about who stayed and when. Now that I live in an RV and travel all the time, I'd probably be down with having a co-pilot every once in a while during drives.
More to the point, though I hate playing the fearful American, when using Couchsurfing or AirBnB, you know the host's address. When you get in a car, you could end up anywhere.
For most people, I'm guessing the free gas does not outweigh the inconvenience of coordinating the pickup and/or going even slightly out of one's way.
Great business ideas save people time and/or money. This is saving people a little money at the expense of their time.
On the other hand, I know that there's nothing wrong (insurance-wise) with accepting gas money from a friend... and, to push it further, if a friend of a friend needed a lift somewhere that I was already going, my insurance would probably be fine with that, and I'd definitely accept gas money in that situation...
And what if the person you're riding with is too chatty and you just wanted to nap the whole ride? :)