The road was closed in March after five days of torrential rain left the roads too dangerous for motorists to use.

Landslips and erosion along the slopes were the result of 346 millimetres of rainfall over the short period of time.

Bathurst MP and Regional Roads Minister Paul Toole acknowledged the hard work that was put in to restore access to the most direct route between Oberon and Sydney.

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"We have had a crew of about 20 people working tirelessly to get this section of road back on track, stabilising the upslope using techniques like soil nailing and hydro-mulching," Mr Toole said.

"We know how important a connection this road is for locals and the freight industry, and reopening this section will mean motorists from Sydney can now travel to the area without having to go via Lithgow and Bathurst."

Detouring via Bathurst has been costing freight companies a large sum of money, with Oberon Quarries owner Neil Hargraves stating that the extra travel was costing the business $15,000 a week, and the truck drivers were having to work longer days.

"Although reduced speed limits will apply, road users will now have single-lane alternating access through this section in both directions, which will save a lot of time detouring around the winding road that has been built to follow the mountain range," Mr Toole said.

Further work will continue to permanently fix the stretch of road at Hampton but is unlikely to affect traffic.

Access to the Jenolan Caves precinct via Two Mile reopened on May 10, while the damage to Five Mile is significant and geotechnical engineers are currently carrying out investigations on the slopes and road, and this section is expected to be closed for an extended period.

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