In order to supervise a learner driver in Western Australia you must:
Have held a current valid driver’s licence in the class of vehicle you’ll be teaching for a minimum of four years.
Display visible L plates on your vehicle at all times whilst the learner driver is in control of the vehicle.
Be aware of all road rules for novice drivers.
A common question is whether or not a learner driver supervisor is allowed to have alcohol in their system while instructing the driver. The answer is no. All learner driver supervisors are subject to the same alcohol and drug provisions as if they were in control of the vehicle.