Truck drivers say flow-on effects from a significant disruption impacts services for days, and they're calling for better communications

In a blog, the National Road Carriers Association says State Highway One closed in Marlborough for nine hours near Ward after a recent three-vehicle crash - affecting several trucks.

Days later, truckers were caught up by slips in Awakino Gorge.

Association General Manager James Smith says not being able to use roads costs the economy millions - and disrupts the supply chain.