Speed limits on stretches of the A6 have been reduced by Derbyshire County Council as part of a nationwide safety review.
Motorists are being urged to look out for signs showing the new 30mph limits.
The A6 has been reduced from 40mph to 30mph at:
- Darley Dale
- Northwood near Rowsley
- Furness Vale between Bridgemont and New Town
- Existing 30mph limits in Matlock Bath and Dove Holes have also been extended.
Work to examine around 600 miles of roads across the county started in September last year.