Those smaller letters can be approximated by Bryant Condensed and Bryant Compressed from Process Type Foundry.

Thanks for the recommendation. I didn't see an italic for the condensed/compressed versions. I really need italics, unfortunately. Any other recommendations? It would be great if I could figure out the exact font.

It could be that it isn’t a digital font, but a sign-making specialised typeface.
Here’s a list of some rounded sans serif fonts:
http://www.typophile.com/node/81027#comment-459522