A team of litter pickers cleared 10.5 tonnes of rubbish from the A41 over six days.
The clean-up focused on collecting rubbish that had been thrown from vehicles, fallen from insecure lorry loads or simply been dumped along 26 miles of the dual carriageway.
The team of 16 from Dacorum Borough Council’s (DBC) Clean Safe and Green team worked their way down from the M25 junction at Kings Langley through to Tring and back.
Craig Thorpe, group manager for environmental services at DBC, said: “Litter thrown on a high speed road is reckless, dangerous to vehicles and wildlife and costly to remove.
“It costs around £40,000 a year in traffic management, labour, equipment and disposal costs to pick up people’s rubbish that shouldn’t have been dropped in the first place.
“I urge drivers and passengers to take their litter home with them and to help us keep our roads clean, safe and welcoming.”
Among the litter was coffee cups, drink cans and fast food packaging thrown out of vehicles, along with fly tipped rubbish.
Advice about recycling, collections and what can go in residents’ different bins is available at www.dacorum.gov.uk/recycling
Residents can also call 01442 228000 and ask for waste services.
Household Waste Recycling Centres (HWRCS) are provided by Hertfordshire County Council. More information about these can be found at www.hertsdirect.org/wasteaware