This is the cleanest, flatest design of my apps. A lot of texture in the background and a lot of opacity applied to most elements, but no shadowing or 3D effects. I like the monochromatic nature of this app. Any use of color really re-enforces the user experience. The yellow tab bar buttons showing where you are in the app, the yellow highlight on a list selection and even the green, yellow, and red status indicators all stand out helping the user focus on what's important.
This minimalist design also hides a lot of complexity in this app, which includes the ability to plan a trip, record milestones, get weather forecasts, call your roadside service for help (which unfortunately I've needed), and share your trip info and photos via social media outlets.