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M25 between J20 and J21, Hertfordshire (Grid ref TL100029) C, Tom's Lane, Hertfordshire (Grid ref TL096035) M1 between J6 and J6A, Hertfordshire (Grid ref TL118024) C77, Hill Farm Avenue, Hertfordshire (Grid ref TL101009) A405 between M1 and M25, Hertfordshire (Grid ref TL119022) M1 between J6A and J7, Hertfordshire (Grid ref TL112046) U, Hazelbury Avenue, Hertfordshire (Grid ref TL084013) U, Gallows Hill, Hertfordshire (Grid ref TL082014) U, Hazelwood Lane, Hertfordshire (Grid ref TL085011) M25 between J21A and J21, Hertfordshire (Grid ref TL125031) U, Lauderdale Road, Hertfordshire (Grid ref TL084008) A405 between A412 and M1, Hertfordshire (Grid ref TL117010) A4251 between Nash Mills Lane, Hemel Hempstead and Home Park Mill Link Rd, Kings Langley, Hertfordshire (Grid ref TL074020) A405 between A41 and A412, Hertfordshire (Grid ref TL110004) A4251 between Home Park Mill Link Rd, Kings Langley and M25 Jn20, Hertfordshire (Grid ref TL075017) A41, Abbots Langley, Hertfordshire (Grid ref TQ094999) A4147 between Greenacres, Hemel Hempstead and King Harry Lane roundabout, Hertfordshire (Grid ref TL100060) C, Sheepcot Lane, Hertfordshire (Grid ref TQ111999) U, Highwoodhall Lane, Hertfordshire (Grid ref TL074047) A41, Hertfordshire (Grid ref TQ095996)