The new tractors are a mix of DAF, Mercedes-Benz, MAN and Iveco units, all fitted with telematics as standard.
As for the trailers, they include 200 curtainsiders, 100 fridge trailers and 50 box trailers.
"This latest investment in new assets will endow Ryder with one of the largest and most comprehensive Euro 6 fleets in the country enabling our rental customers to have access to the benefits of this new technology," states David Hunt, vice president and managing director Ryder Europe.
"Our significant investment in new trailers will ensure that Ryder maintains its leadership position intrailer rental with an extensive range of options for customers.
"We also continue to invest in our personnel and workshops across our national network of 28 locations with all of our workshops equipped, and our staff trained, to support the specialised maintenance requirements of Euro 6 specification vehicles."
This year's investment in new assets follows the company's multi million pound purchase of nearly 1,000 Euro 5 derogated vehicles in 2014.
Ryder maintains one of the largest and youngest HGV rental fleets in the UK with this year's investment in new vehicles ensuring that the average age of rental trucks remains at 24 months.