Maybe they just wanted a free ride to California almond groves....or a vacation in some exotic locale and didn't want to be bothered with flying.
http://mashable.com/2016/05/25/bees-chase-grandma-car/#B.6QgR_9NEqj
http://mashable.com/2016/05/25/bees-chase-grandma-car/#B.6QgR_9NEqj