Northbound roads or vehicles lead or are travelling towards the north.
A 25 mile traffic jam clogged the ~ carriageway of the M6...
Traffic was already very congested by six thirty this morning, particularly on the M1 ~.
ADJ: ADJ n, n ADJ
NORTHBOUND
Meaning of NORTHBOUND in English
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012