One of the replies below the tweet points out that RFID tags have been present in tires since 2003, and provides this reference:<p><a href="http:&#x2F;&#x2F;www.rfidjournal.com&#x2F;articles&#x2F;view?269" rel="nofollow">http:&#x2F;&#x2F;www.rfidjournal.com&#x2F;articles&#x2F;view?269</a><p>The intended purpose is being able to track tires that are subject to safety recalls.