UBER is a cell phone app which makes the business of hailing a cab much easier.
One need only press the UBER button and instantly one knows where the next cab is, how long the ride will take, how much the ride will cost, and the fare will even come right out of a linked account. No fuss no muss.
The taxi companies hate UBER however and the start-up has had to fight entrenched interests in nearly every urban area it has entered. Detroit is no different. But unlike in most urban areas the taxi companies are not particularly strong in the Motor City so UBER has an advantage.
Disruptive technologies are always fought by vested interests. Even, and especially when such technologies make life better for the average person. Hopefully in Detroit innovation will win out.