If you find yourself design billboards, you would be wise to test your design for readability. There are several ways designers have tested their work over the years, but Lamar Outdoor has by far one of the coolest (and easiest) ways to do it.
Visit the Lamar Outdoor Creative Test page. You can upload a JPG of your outdoor board (300×150 pixels at 72 dpi works best), then answer a few questions about the test view you would like to see. You can choose the type of outdoor board (bulletin, poster, bus shelter, etc.), a rough or smooth road, and the typical speed of the vehicle (20, 50 or 70MPH).
Once you click Drive, a video of what your outdoor board will look like to the driver under your parameters will be displayed in a clean, simple movie.
While not perfect, Lamar’s testing tool offers you a quick and free way to test for readability.