• Severe 50 mph M1 Hertfordshire
  • Medium M25 Hertfordshire
  • Medium 50 mph M1 Greater London
  • Medium A41 North Western Avenue Colne Way Watford
  • Slight A5183 High Street Elstree
  • Slight A6129 Stanborough Road Welwyn Garden City
  • Slight A1250 The Causeway Bishop's Stortford
  • Slight Brook Hill Stevenage
  • Slight A1170 High Street Hoddesdon
  • Slight A414 Hemel Hempstead
  • Slight A414 Hertford Road Hatfield
  • Slight B176 Crossbrook Street Cheshunt
  • Slight 40 mph A600 Bedford Road Hitchin
  • Low Impact Greenwood Drive Watford
  • Low Impact 40 mph B1004 Great Hadham Road Little Hadham
  • Low Impact Dane O'coys Road Bishop's Stortford
  • Low Impact Noke Lane St Albans
  • Low Impact Stotfold Road Letchworth
  • Low Impact B5378 Shenley Road Borehamwood
  • Low Impact Quakers Lane Potters Bar
  • Low Impact Station Road Ware
  • Low Impact King Harry Lane St Albans
  • Low Impact Hollybush Lane Harpenden
  • Low Impact Ford Street Braughing
  • Low Impact Batchwood Drive St Albans
  • Low Impact Whippendell Road Watford
  • Low Impact Weston Road Stevenage
  • Low Impact Trumper Road Stevenage
  • Low Impact Hertford Road Stevenage
  • Low Impact Bogmoor Road Barley
  • Low Impact 40 mph B1004 Winding Hill Much Hadham
  • Low Impact Gorelands Lane Chalfont St Giles
  • Low Impact Station Way St Albans
  • Low Impact B656 Walsworth Road Hitchin
  • Low Impact Shantock Hall Lane Hemel Hempstead
  • Low Impact Pond Road Hemel Hempstead
  • Low Impact Gorelands Lane Chalfont St Giles