Catch A Cab

Hi guys!
Today we'd like to share a new interesting app idea and UI concept for it.
Being in an unknown city, you'd probably want to take a taxi. All you need is your smartphone camera. Point it at a passing taxi and it will recognize a special marking, and define a taxi service for you. Then you just book a taxi from this service, confirm your location, and wait for a car. Simple as that! Hope you like it. Waiting for feedback!