A Highways Agency spokeswoman...

A Highways Agency spokeswoman said: "The pilot scheme was developed to stop the emergency services getting punctures." Vehicles using the extra lane suffer because of metal debris conventional brushes leave behind. This unique lorry collects nails and other sharp objects as it drives over them.

"There are already similar vehicles operating at airports, but this is the first roadgoing version in the UK," added the spokeswoman. She said she expected the set-up to be adopted nationwide if it proves a success in the south-east of England, where it"s currently being trialled. Traditional mechanical brushes and high-pressure hoses are also fitted to the lorry.