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A411 between A409 and A41(T), Hertfordshire (Grid ref TQ160950) A41 between A5183 / A5 and A411, Hertfordshire (Grid ref TQ164950) A409 between Hertfordshire boundary and A411, Hertfordshire (Grid ref TQ156945) A411 between A41(T) and A5183, Hertfordshire (Grid ref TQ170951) M1 between Harrow boundary and Harrow boundary, Harrow (Grid ref TQ169946) A411 between A4140 and A409, Hertfordshire (Grid ref TQ150946) A409 between A4140 and Harrow boundary, Harrow (Grid ref TQ154940) A41 between A411 and B462, Hertfordshire (Grid ref TQ150959) A4140 between A409 and A411, Hertfordshire (Grid ref TQ150940) A4140 between A410 and Harrow boundary, Harrow (Grid ref TQ160934) A5 between Harrow boundary and A41, Harrow (Grid ref TQ173942) A41 between Hertfordshire boundary and A5183, Hertfordshire (Grid ref TQ175944) C, Aldenham Road, Hertfordshire (Grid ref TQ165965) M1 between A41 and LA boundary, Barnet (Grid ref TQ175943) A5183 between A41 and A411, Hertfordshire (Grid ref TQ176950) U, The Comyns, Hertfordshire (Grid ref TQ144943) M1 between LA boundary and J5, Hertfordshire (Grid ref TQ147961) A41 between M1 spur and Barnet boundary, Barnet (Grid ref TQ176942) U, Harcourt Road, Hertfordshire (Grid ref TQ140960) U, Little Bushy Lane, Hertfordshire (Grid ref TQ142964)