I wrote:

     >  I put a wonderful bumper sticker on my car in an attempt to deal with
     this >       very problem.  The Pennsylvania SHPO has this blue sticker
     that says "I
     >       brake for historical markers."

     Heidi wrote:

     "How does one acquire such a gem? I should put it on my car as a public
     service, kinda like those handicapped plates..."

     I got mine from the Pennsylvania SHPO.  I got it some time ago, but I'm
     pretty sure they still have them.  They cost $2.  Address:
        Pennsylvania Historical & Museum Commission
        Museum Shop
        P. O. Box 1026
        Harrisburg, PA 17108
        (717) 787-2891

     I don't have an e-mail address.

     I'm sure they would be delighted to be overwhelmed with orders.

     Marilyn