Perhaps the cab companies could work together to raise funds for a isolated road network (call it something web 2.0 like "rails") and then offer to drive on the "rails", subsidising your journey by making you share with others in the cab. In fact why not have the driver sit in the "cab" and you can ride in a trailer behind, with the othr passengers.

I think we are onto something.

:-)

(could not resist)

Edit: in all seriousness I looked quite hard for ride-shares to help me with a killer commute. I even looked at the price of a daily taxi doing 100 miles pday (ha ha ha) and one a different contract was amazed to find a large 16 wheeler coach that passed by my house (in commuter-land) and dropped off in Central London on the same street as the clients office. (Notably with the coffee shop between the drop off point and the office, saving everyone some time.)