Where not to use a QR code
I recently saw a QR code in a spot I never expected to see one: on a billboard on Interstate 70. 
I wanted to take a picture to show why it is a bad idea to have a QR code on a billboard, but I couldn’t. It’s on a major interstate. Not a good idea to drive and try to use your phone’s camera at the same time – which is precisely why you shouldn’t put a QR code up on a billboard.
QR codes are good for offering an easy link to something special, but you have to put them in a situation where they are easy to scan. Driving by high speeds is not conducive to scanning. Think how the QR code can add real value to your marketing or communications plan, instead of just using as a high tech way to say “Look at me!”
For example, instead of embedding a QR code with a link to your web site on your business card, link to a vCard so that all your info goes straight to the scanner’s phone with no fuss, no muss, no typing.
All flash and no substance doesn’t take you far, so think about if you have a viable purpose for your QR code before you use it.



