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Nepean Hwy shut down: Innocent motorist killed, several injured

(Image: Australian Traffic Network)

A 45-year-old Mount Martha woman has died in shocking circumstances after a collision on the Nepean Highway.

The crash near Ti-Tree Grove at Seaford forced the Nepean Highway’s closure to all peak-hour traffic.

Police say the collision was caused by a south-bound black Nissan Navara crossing into the north-bound lanes.

The Nissan made “very heavy impact” with a Mazda CX-6 which was travelling north-bound, killing the driver.

“The poor woman wouldn’t have stood a chance,” Detective Senior Sergeant Brad McArthur told 3AW’s Neil Mitchell.

“An innocent motorist killed just going about her daily business.”

The driver of the Nissan was arrested by an off-duty police officer before being taken to The Alfred hospital with non-life threatening injuries.

The Nissan and Mazda also struck two other vehicles travelling north-bound.

The air ambulance was dispatched to attend three other injured people.

The Department of Transport says closures are expected to remain in place until this afternoon.

Police say they received sightings of a Nissan Navara driving erratically in Mordialloc prior to the collision. The vehicle is believed to be the car that was involved in the horrific crash.

Anyone who saw the Nissan behaving erratically, or who has dashcam footage of the car travelling on Nepean Hwy between Mordiallic and Seaford is urged to contact police.

Drivers are encouraged to use the Frankston Freeway as an alternative and to allow plenty of extra time.

Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report at