According to the U.S. Department of Transportation, northbound traffic has increased steadily through the years at Arizona’s ports of entry in Nogales, San Luis, Douglas, Lukeville, Naco and Sasabe.  Commercial trucks are up 2.1 percent (388,657 total), passenger vehicles up 4.5 percent (8.9 million total) and people visiting Arizona up 4.1 percent (23.8 million total).