Design for traffic, not a desk
Use bold lettering, strong contrast and a simple message. Tiny service lists and decorative type may look attractive up close but become unreadable from another lane.
Plan around the vehicle
Door seams, handles, wheel wells, body curves and windows affect placement. A layout should be sized for the exact year, make and model whenever possible.
Keep a fleet consistent
Use the same logo, colors, wording and phone-number treatment on every vehicle so customers recognize the company repeatedly across Northwest Indiana.