Mr Crowley,
You are taking things out of context. What is fascinating is that, if one goes to the link you provided and finds the text you quoted, one will see that it has a footnote referenced. Looking at the footnote, one will see
1. A brief investigatory stop based upon reasonably articulable suspicion is not an arrest. Terry v. Ohio, 392 U.S. 1, 21 (1968).
Now, while this clearly is not what happened to Badnarik, it
is clear that there is indeed a distinction between a brief detention to investigate or issue a cite or summons.
Justin:
yes, you're quite correct. However, every time you are pulled over you are NOT arrested, just because you CAN be if you refuse to sign the ticket. Different jurisdictions will differ on the exact details...in some places it may be considered an arrest on the spot. Most places, however, it is not. You're issued a cite in lieu of an arrest, and the arrest is only done if you fail to comply with the procedure to be cited.
Witness, for instance, the flap over the candybar chewing woman on the DC metro. AFAIK, she was detained briefly to be issued a cite, and she chose to storm off, thus turning a detention (for the purpose of issuing a citation) into an arrest.
Mike