Drivers are being warned to stay in their cars along the Snowy Mountains Highway near Adelong, where a truck crash led to a toxic spill on Monday night.
Tumut Police acting inspector Matt Fowler said the B-double was carrying 20 kilograms of sodium sulfate when it rolled just west of the township.
He warned the chemical could prove toxic if breathed in.
"It is not explosive and not flammable, but it is toxic," Inspector Fowler said.
"We're waiting for a repair to be done to the truck this morning for it to be safely towed from the scene."
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A small quantity of the sodium sulfate leaked from the truck into an adjacent field, and hazmat crews will be on the scene in case of further spillage.
The truck driver received only non-life-threatening injuries and was taken to Wagga Base Hospital for treatment.
Tumut police that the crash was caused by "driver error" in combination with the rainy conditions, which had made the roads slippery.
The truck is on the side of the road, which has been cleared for traffic, however drivers are being warned to stay away from the site of the crash and the adjoining paddock.
The truck is expected to be removed from the scene by the end of Tuesday.
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