Hi there, just a quick explanation about the design I submitted. My main focus has been the visibility for the others cars around (red lights/stops etc) and/or pedestrians. Given this idea, I then focus on the 3 things I believe you want people to remember :
1. Who you are
2. What's your activity
3. How to contact you.
Given all that, the main informations are all at eyes level, and I tried to minimize everything that would distract the people. I also took into account the price and maintenance cost of the vynil, by minimizing the surface.