I got the State Dept. FCU Visa Chip + Pin card (and in fact received a PIN# in the mail for it and a book explaning how chip+pin works) to use in my recent ED trip. I was all eager and ready to test the Chip+Pin function however, every time that I used the card where the chip was read (not swiped) it automatically printed the receipt for me to sign.
I'm not sure if the operator has the ability to select pin or paper, because at a gas station the person paying with CC before me had to enter pin, when I paid it print out a receipt... When I used it at a peage booth it didn't ask for PIN (or Sig, for that matter).
Unfortunately wasn't able to try it out in an automated station.