UPDATE at 1538hrs
W5 unaffected as already on diversion for Hornsey Lane NO21/20047
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The northbound carriageway is blocked just before Macdonald Road, by a broken down van.
Routes affected: 4, C11, W5
4, C11, W5 N/B - From Archway Road, A into Archway Gyratory, R Junction Road, R Vorley Road, R Macdonald Road, L Highgate Hill LOR.
Diversion reference: D38478