FedEx Freight, the less-than-truckload (LTL) unit of FedEx Corp., said today it will impose a 6.75-percent rate increase on non-contractual traffic moving within the United States and within Canada, on shipments moving across the U.S.-Canadian border, and on U.S.-originating freight bound for Mexico.

The increase, which takes effect Sept. 6, makes FedEx Freight the fifth and the largest LTL carrier to impose a so-called general rate increase in recent weeks. The other four—UPS Freight, YRC Worldwide Inc., ABF Freight System Inc., and Con-way Freight—all took 6.9-percent increases effective at the beginning of August.

FedEx Freight, which has overtaken YRC as the nation's largest LTL carrier by sales, said its fuel surcharge will remain unchanged, though minimum charges and prices on other services will rise.