THOMASVILLE, N.C. - Old Dominion Freight Line, Inc. (NASDAQ: ODFL) today reported a year-over-year increase in its less-than-truckload ("LTL") tons per day for May 2015 of 9.6%, which followed comparable-period growth of 9.7% for April 2015. Based on these results, Old Dominion updated its 2015 second-quarter expectations for growth in LTL tons per day to a range of 9.5% to 10.0% over the second quarter of 2014 from the previously disclosed range of 9.0% to 10.0%. The Company also updated its expectations for year-over-year growth in LTL revenue per hundredweight, excluding fuel surcharges, for its second quarter of 2015 to a range of 5.0% to 5.5% from the previously disclosed range of 5.5% to 6.5%. David S. Congdon, Vice Chairman and Chief Executive Officer of Old Dominion, commented, "We are pleased with the continued growth in our LTL tons per day, especially with the slowdown of the domestic economy this year. Our growth is supported by our ability to win market share as we continue to provide our customers with superior service at a fair price. We have, however, decreased our second-quarter guidance for revenue per hundredweight because the year-over-year increase in May was not as strong as we had anticipated. The quarterly year-over-year comparison will also be affected by our general rate increase implemented in May 2014. Our yield metrics for May 2015 were consistent with those in April 2015, and our updated second-quarter guidance continues to assume sequential improvement for the quarter. We remain disciplined with our pricing and believe the industry pricing environment continues to be stable."