Police are calling for witnesses and dash-cam vision to a near miss incident on Pinjarra Road, Barragup.
Around 11am Thursday February 4, it's reported an older style silver Land Rover was travelling south towards Pinjarra when the driver started to drive erratically.
It's alleged at one time overtaking traffic on the left-hand gravel shoulder before just missing a tow truck travelling in the same direction.
The Land Rover then continued at speed towards Pinjarra.
Authorities are appealing for anyone who witnessed this incident or who may have dash-cam footage to make contact with Crime Stoppers by calling 1800 333 000 or by making a report online at www.crimestopperswa.com.au.