For those keeping track, add Illinois to the states that have adopted Clearview font on their highway signs. An informal list of states using the font include:

Michigan, Pennsylvania, and Texas in essentially all new sign installations

Virginia, Kentucky, Arkansas, Florida, Vermont, California and now Illinois that sporadically use Clearview.

Interstate 57 north and 70 east approaching their split. Even the Interstate shields include Clearview numbers. Thanks goes to Kerrie Field for the photo taken 11/17/07!

I am sure that there are some states that I am missing, but the font is definitely pervading across the land at a rapid pace.