Why is Old Dominion Freight Line stock sliding 6% today?

Old Dominion Freight Line stock is experiencing a 6% decline today. This downward trend is linked to the expansion of Amazon LTL services, which is impacting several companies in the sector. In addition to Old Dominion, the stocks of Saia and FedEx Freight are also being affected by Amazon's strategic growth in the Less-Than-Truckload market, creating a challenging environment for these established freight carriers as they face increased competition from the e-commerce giant's logistics operations.