NSW Roads Minister Duncan Gay is pursuing a speed limit increase along the Pacific and Hume Highways, from 110km/h to 120km/h on dry days, claiming that current speed limits didn't reflect the latest automotive standards.

The minister's comments follow a decision in the Northern Territory where motorists were permanently allowed to choose their own speed along a 276 kilometre section of highway following a successful 18 month evidence-based trial.

NSW Roads Minister Duncan Gay is seeking a speed increase along the Pacific and Hume Highways.

In a decision condemned by medical authorities, Territory Chief Minister Adam Giles on Thursday handed down a report confirming that open speed limits had reduced the number of accidents along the trial section of the Stuart Highway when compared with a 130km/h posting previously in place.

In NSW, Mr Gay has ordered Roads and Maritime Services to cost remediation works on both the Pacific and Hume Highways which would mandate grade-separated intersections and crossroads.