The incident which happened in California was noticed by Zandr Milewski, whoposted a pictureof the incident on Facebook.
(Presumably, he meant the human sitting in the front seat.)
Googleconfirmed the report with its own post on Google+.
Bet humans dont get pulled over for that too often, the companyquipped.
They have also been programmed to be extra-careful on the roads.
According to Googlesself-driving car FAQ:
The cars drive conservatively.
source: www.techworm.net