Growth from new and existing contracts has seen CM Downton add 300 new vehicles to its fleet.
The operator has bought 100 Daf XF 6x2 tractor units fitted with Super Space cabs and AS Tronic automatic transmission.
CM Downton MD Andy Downton said the business chose the fleet additions off the back of strong relationships with the three manufacturers.
"We have secured significant new business recently and increased operations with a number of existing clients," he said. "These new vehicles will provide additional capacity and flexibility to meet the demands of these operations.
"We’ve always invested in high performance and quality products to support our business and our current fleet predominantly comprises equipment from Daf, Cartwright and Tiger Trailers."
CM Downton will take delivery of the new vehicles throughout 2017.