Faster and safer journeys are on the way for motorists who use Heathcote Road with a $173 million funding package for the key southern Sydney route.

The budget investment will improve safety and traffic flow on Heathcote Road including widening the existing bridge across the Woronora River at Engadine and duplicating 2.2 kilometres between Infantry Parade and The Avenue at Holsworthy.

Treasurer Dominic Perrottet said NSW Budget 2018 was about investing in things that make a difference to the everyday lives of people across NSW.

“We all hate being stuck in traffic, so for the 36,000 drivers who use this road everyday this funding will improve safety and ease congestion to improve trips along this important stretch of road,” Mr Perrottet said.

Minister for Roads, Maritime and Freight Melinda Pavey said Heathcote Road is a major link providing access between Sydney’s southern suburbs and the motorway network around Liverpool.

“Improving traffic flow to meet existing and future growth is vitally important to make sure people can move around this area safely and quickly as possible,” Mrs Pavey said.

Member for Heathcote Lee Evans said the bridge’s narrow lanes and approaches will be widened and road shoulders installed to improve safety and traffic flow.

“Work will also be carried out to build additional climbing lanes on either side of the bridge crossing, to further help improve safety,” Mr Evans said.

Member for Holsworthy Melanie Gibbons said the two kilometre upgrade between Infantry Parade at Holsworthy and the Avenue at Voyager Point would widen the road to two lanes in each direction reducing congestion.

“The upgrade would also improve pedestrian and cyclist connectivity providing a key link for drivers, pedestrians or cyclists to Holsworthy Train Station and the Holsworthy Army Barracks,” Ms Gibbons said.