From September 26, motorists will no longer need to slow down to 40km/h on roads with speed limits of 90km/h or more when passing stationary emergency vehicles with flashing lights, Transport for NSW says.
A Transport for NSW spokesperson said drivers would need to slow down safely and move over, to give them as much space as possible.
In speed zones of 80km/h or less, motorists would still need to slow down to 40km/h.
The rule would also be expanded to include stationary tow trucks and breakdown assistance vehicles displaying yellow flashing lights.
This would include changing lanes on a multi-lane road if it was safe to do so.
The spokesperson said changes were made as a result of a review of the 12 month trial, which included community feedback.
"This rule is being changed to improve the safety of emergency services personnel, tow truck operators and breakdown assistance providers working on the road, as well as the people they are helping," a spokesperson said.
"The changes will also make it safer on higher speed roads where the time and distance required to reduce speed to 40km/h is the greatest.
"The rule will protect more vulnerable roadside workers."
All motorists must also give way to any person on foot in the vicinity of a stationary tow truck, breakdown assistance or emergency vehicle displaying flashing lights.
Motorists must not increase their speed until they are a sufficient distance past all the vehicles and people involved.
The rule does not apply when a stationary tow truck, breakdown assistance or emergency vehicle displaying flashing lights is on the opposite side of a divided road separated by a median strip.
More information go to http://bit.ly/slowdowngivespace