I followed this truck for a few miles on I-5 in Northern California. I liked the passing instructions printed on the back. Just in case you can't see the photo clear enough to read those instructions, here is what they say. The message on the green sign, which directs you to pass on the left, says "Passing Zone." The other sign, in red, points to the right and says "Suicide Zone." It's nice to see a truck with a sense of humor.