The Territory's Country Liberals Government has said it wants the Open Speed Zone to expand even further north through to Tennant Creek and Katherine, with the Barkly Highway to be examined after NT's next election in late August.
"We're committed to giving responsibility back to you," states NT Chief Minister Adam Giles on his Facebook page.
"Territorians have always acted sensibly in open speed limit zones, with 85 per cent of drivers travelling between 133-139km/h, and most driving to the conditions.
"Of the 11 crashes that occurred during the 2014 year-long trial period on stretches of the Stuart Highway, there were no fatalities. And of the one serious injury reported, alcohol and not wearing a seatbelt were factors," Giles wrote.
Giles said the NT's Labor Party would bring back the limit should it win the looming local election in late August.
"Make no mistake – the Opposition will remove open speed limits," he said.
"You will lose under Labor. The Territory has a unique road network, and we'll continue to expand, upgrade, and take an evidence-based approach to speed limits on our major highways."
Should the Country Liberals Party be re-elected, it has said it will also fund a lifting of the speed limit on a 75km section between Mataranka and Larrimah and a 47km section between Daly Waters and Dunmurra, before turning its attention to other outback arterials.