The freight testing site is operating at the Blackbutt rest area on the Newell Highway for trucks travelling north.

It's staffed from 6am to 9pm, seven days a week. Tests outside that time will be done with assistance from telehealth.

Dubbo MP Dugald Saunders said there had been "quite a few" truck drivers calling for a freight testing site in the Dubbo region.

He said the site played a really important part of the testing regime that truck drivers needed to go through.

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Three tests were done in the first hour it was open on Monday.

Freight workers are encouraged to be tested every seven days. For those who live in Greater Sydney, the weekly testing is mandatory.

A heavy vehicle test site is also available at Forbes Caltex Service Centre. Assisted testing at that site is available on weekdays, while at night and on weekends telehealth is available to help.

Minister for Regional Transport and Roads Paul Toole said more than 70,000 tests had been undertaken across all of the freight-friendly testing sites since the first one was opened 12 months ago.

He said in the last month there had been a 228 per cent increase in the number of tests they had performed.

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