The American Trucking Associations' advanced seasonally adjusted for-hire truck tonnage index increased 2.9 percent in January after jumping 2.4 percent in December. Tonnage has surged at least 2.4 percent every month since November, gaining a total of 9.1 percent over that period. As a result, the SA index equaled 125.2 (2000=100) in January versus 121.7 in December. January's index was the highest on record. Compared with January 2012, the SA index was up a robust 6.5 percent the best year-over-year result since December 2011.