The Freeway Blogger has declared October 13 to be Freeway Free Speech Day.

On October 13th, hundreds of activists nationwide will post signs critical of the Bush Administration on area freeways, reaching millions of voters in states from Maine to California. The Freeway Blogger has posted more than 2000 such signs over the last year.

In addition to coordinating activists, we will launch a nationwide media campaign to promote the fact that hundreds (if not thousands) of these signs are going up across America on the same day, and to highlight this newest, and oldest, form of civic dialog. We anticipate wide-spread news coverage about this powerful grassroots effort.

...We are asking for your help in posting signs and recruiting activists, especially in the following states: Arizona, Arkansas, Colorado, Florida, Iowa, Louisiana, Maine, Michigan, Minnesota, Missouri, Nevada, New Mexico, New Hampshire, North Carolina, Ohio, Oregon, Pennsylvania, Tennessee, Virginia, Washington, West Virginia, and Wisconsin.

[link via Atrios.]