6. The linking carriageways are—
(a)the southbound carriageway from the M42 to junction 4a, beginning at the southern edge of the bridge carrying the M42 northbound traffic and ending at the merge with the M5 southbound; and
(b)the eastbound carriageway from junction 4a to the M42, beginning at the diverge from the M5 northbound and ending at a point 180 metres north of the northern edge of the bridge carrying Fockbury Mill Lane over the M5.