Write your web adress in BOLD at your car or motorcycle it will be the source of constant traffic.LOL! REAL TRAFFIC 2 WEB TRAFFIC ! i have personally observed this and this tip gave me 10 visitors in just 1 day. hope it will be benificial to you.
Instead of ruining my car for 10 visitors a day I think I will just add it to my signature here and get over 10 visitors a day. Doing that type of marketing only works when you get your vehicle wrapped in a vinyl wrap and sit it outside a very busy event and then you will see an ok amount but its more for exposure of your logo and name recognition then actual clicks to the website.