big change for trucking in California, 53 foot trailers must have skirts as of 1-1-16, and older than 2007 trucks will no longer be allowed to work in the state

Found on http://www.atlanticgreatdane.com/wp-content/uploads/2013/06/Volume-11-issue-1.pdf
 http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=201520160AB857