Transport for NSW has reduced the speed from 70 km/h as part of works surrounding the new roundabout on the NDR and William Maker Drive.

The new speed limit will apply to a 1.2 kilometre stretch of Hill Street leading to the NDR near the Botanic Gardens.

Transport for NSW West assistant director Alistair Lunn said the change had been made after reviewing safety issues.

"[It] will give motorists a safer stopping speed reducing the likelihood of crashes, with minimal increase to journey times," he said.

Orange mayor Cr Reg Kidd said he supported the cut.

"I think it makes a lot of sense, it is in a built-up area," he said.

Cr Kidd also announced the roundabout works, which started in February and were delayed by wet weather in winter, were nearly finished.

It is expected the roundabout will be open to traffic by the end of next week but works are still continuing.

"This roundabout will be one of the biggest in our region, and will be taking on up to 15,000 vehicles a day," he said.

"Local contractor Hamcon Civil has had a tough job building a new road and a new concrete roundabout all while dealing with traffic."

OCC Infrastructure committee chair Cr Jeff Whitton said the 40km/h work zone speed limit was still in place as well as other restrictions.

"The roundabout will be open to traffic, weather permitting, but it's still a work site," he said.

"The section, which used to be Hill Street, will undergo some drainage work, guard rails will be installed and it will be line marked to become an overflow car park for the Orange Botanic Gardens precinct."

Following concerns about traffic jams in the area, particularly for people taking children to touch football at the Waratah sports ground on Wednesday nights Cr Whitton said people should use alternate routes until the work was completed.

"The end is in sight, but for the next couple of weeks, avoid the area if you can, if you're taking the kids to touch footy avoid Anson Street and use the roundabouts at Burrendong Way or Leeds Parade to access the NDR," he said.

Council expects the final layer of asphalt on the roundabout to be laid from about December 7.