Police stopped the Kenworth heavy vehicle for random testing around 8.40pm on Thursday, subjecting the driver to a breath and drug test.

The 47-year-old passed the breath test, however the roadside drug returned a positive result, police said.

Highway patrol officers spoke further with the driver before conducting a search of the both the driver and the truck.

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That search allegedly uncovered a "clear crystal substance that the driver identified as speed" as well as a glass pipe.

"After further observations of the driver he was subjected to an assessment of sobriety," police said.

"As a result of that the driver was conveyed to Cootamundra Hospital where a sample of blood and urine were obtained."

The man has been charged with possessing a prohibited drug and further charges are pending the outcome of the blood and urine analysis, police said.

A further examination of the driver's work diary will also be conducted.

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