I definitely think digital billboards should be regulated. I have found myself looking at them for way too long while I'm driving, waiting for them to change or do something cool. We already have enough distractions on the road and enough advertising in our lives. There is no need to have digital changing billboards. I don't have any problems with the ones that just stay still...even though I suppose people will still be looking at them to see if they will change whether they actually do or not.