Random Driving Thoughts

This last weekend I drove up to my mom's for Easter. After having lived in NJ for 13 years I'm used to the drive, but it's still 5 hours in the car. With no one to talk to my thoughts tend to wander. Like a good driver (and consumer) I always tend to notice the billboards. This time I got to thinking though as more and more electronic ones seemed to be popping up. Is the electronic billboard really better? I mean, you can use a single, electronic billboard for multiple advertisements - thereby reducing the amount of unsightly & unnatural roadside decorations - but it also must require a large amount of electricity to run constantly. So which is better? More billboards that don't use electricity or fewer billboards that do? Then I thought - what if the "electric" billboards weren't really electric, but instead solar powered? Seems like a potential best of both worlds. Wonder if they exist yet?