Sections of three local highways in the South West Region have been closed due to flooding.

Motorists are advised the Sturt Highway between Narrandera and Wagga Wagga, the Olympic Highway between the Hume Highway and Wagga Wagga and the Hume Highway southbound at Tarcutta and northbound at Holbrook are closed.

No diversions are available for light vehicles at this stage so motorists are encouraged to delay their trips until the highways re-open.

River Road is also closed due to flooding which means the Wymah Ferry service has been closed indefinitely. It is anticipated that more roads may close if the rain continues.

Motorists are encouraged to comply with all road signs, including reduced speeds and any changed traffic conditions and should take extra care when driving on roads today and over the weekend because of the dangers of water on the road.

It is extremely important motorists drive to the conditions, especially as more rain is expected in the next 24 hours.

Road closures will be listed on the RTA website at www.rta.nsw.gov.au.

Further information is also available by calling the Traffic Management Centre on 132 701.

Some simple measures motorists should take in flood conditions:

- If you live in an area where flooding may occur, move your vehicle to higher ground if flooding is expected.

- As well as the risk of damage to your vehicle by leaving it in a flooded area it may also be a hazard or cause obstruction to emergency services.

- Do not drive unless your journey is absolutely necessary.

- If you have to drive in a flooded area, take care. Do not attempt to drive through water if you are unsure of the depth.

- Don't drive through fast-moving water such as at a flooded bridge approach your car could be swept away.

- When driving through water, drive slowly and steadily to avoid creating a wave and allow on-coming traffic to pass first.

- Keep the engine revs high otherwise water in the exhaust could stall the engine.

- If your car stalls, immediately abandon it and climb to higher ground. Watch your footing. Just six inches of fast-moving flood water can sweep you off your feet.

- Test your brakes as soon as you can after driving through water.