For more information and examples go here: http://www.freewayblogger.com
Although I could rhapsodize forever about why more people need to do this, the chief advantages are these:
1)The numbers are staggering. Depending on where and how you place it, a sign that cost you a nickel to make can be seen by over 250,000 people per day.
2) Free Political Speech is not only your right, it's your patriotic duty. When the founding fathers gave us the right to free speech, they didn't do it just because it seemed like a neat idea at the time, they did it for a reason and at least part of that reason was to allow any of us to sound the f-ing alarm if we thought our country was going to hell. It is.
3) It's a Hell of a Lot of Fun. Believe it. Pursued to its maximum effect, freewayblogging combines the arts and sciences of rhetoric, graphic design, engineering, psychology and guerrilla warfare. And it's perfectly legal. Sort of. We'll talk about that more later.
Six Water Heater Boxes and a Small Can of Paint...
The above took me about three hours of painting with foam brushes and an overhead projector. The signs were placed on freeways in between San Diego and San Francisco over Thanksgiving.