The AA and the RAC have expressed concern at a new scheme by the Highways Agency which will, from tomorrow, allow drivers permanent use of the hard shoulder on a section of motorway.

Until now hard-shoulder running has been trialled on some motorways, including the M42 in the Midlands, but only at certain times.

From tomorrow the hard shoulder between ­junctions 23 and 25 on the M25 in Hertfordshire will be available for use by vehicles at all times.

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Then next month the hard shoulder will be available for traffic between junctions 5 and 6/7 of the M25 on the Kent/Surrey border.

The plan is to extend this all-day operation to other motorways.

However representatives from both the AA and the RAC have expressed concerns over safety.