The Bruxner Highway is closed in both directions near Rodgers Road at Tabulam due to an excavator crash.
Light vehicles can divert using local roads.
Heavy vehicles travelling between Casino and Tenterfield can divert via Summerland Way, Gwydir Highway and New England Highway.
This heavy vehicle diversion will add an extra two hours travel time.
Emergency services and traffic crews are on site.
For the latest traffic information, download the Live Traffic NSW app, visit www.livetraffic.com or call 132 701.
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