Police have allegedly found more than $50,000 worth of amphetamines hidden in a car, during a traffic stop in Goulburn in the early hours of Monday morning.

Goulburn police stopped a Toyota Corolla on the Hume Highway at about 1.10am and spoke to the man driving before conducting a search.

Amphetamines with an estimated street value of $56,000 were subsequently seized.

A 26-year-old woman passenger was taken to Goulburn police station and charged with the supply of a prohibited drug in an indictable quantity, and possessing a prohibited drug.

The woman was granted conditional bail and will appear in Goulburn Local Court on January 29.