CHANGED TRAFFIC CONDITIONS Police operation 3:58 pm – M1 Pacific Motorway Ourimbah at Mangrove Road overpass 1 of 3 . Northbound lanes closed. Lane 1. 1 of 3 . Northbound lanes closed. Lane 1. Expect delays. Exercise caution. Emergency services,Transport for NSW, are attending. Heavy traffic conditions. Last checked at 4:04pm.