Darwin drivers who blow under the limit this silly season will be rewarded by police officers with discount fuel vouchers.

It is part of an NT Police initiative to reduce drink-driving over the festive season.

"Obviously we're coming to the Christmas season and we ramp up the random breath test stations to make sure everybody is doing the right thing," Acting Senior Sergeant Craig Dunlop said.

"We're trying to reward good drivers and people who are doing the right thing."

The NT's road toll is four times the national average, with drink-driving a common factor in deaths and car accidents.

Local police already hand out rewards like stubby coolers and car fresheners to responsible drivers as part of the long-running Sober Bob campaign.

NT Police in the country town of Katherine have also previously handed out raffle tickets to sober drivers as part of another initiative to encourage responsible driving.

This month's fuel vouchers for Darwin drivers come in the form of reusable key tags valid until New Year's Eve, and give people five cents off at a large petrol station chain.

"We're not endorsing any of their products. We're just trying to give something back to the drivers," Acting Senior Sergeant Dunlop said.

"We just want to make sure everybody has a safe Christmas, drives safely, and does the right thing."

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The Territory's road toll is currently at 42, compared to 43 at the same time last year.

A Christmas campaign released this month by the NT Government dubbed alcohol as a "weapon" behind the wheel, saying "enough is enough" when it comes to drink-driving.

NT Police are expected to conduct almost 5,000 random breath tests over the 10-day Christmas period, with the vast majority of those in the Darwin region.