A valid AutoPASS contract and a tag in your vehicle will give you a discount at all toll stations marked "AutoPASS". 

Contact a toll service provider to get an AutoPASS toll tag and enter into an agreement. The AutoPASS tag will arrive by post.

General Terms and Conditions for AutoPASS agreement

Which toll road operator should I choose?

You may enter into a primary agreement with any toll road operator that issues toll tags. For example, you may choose the operator that administers the toll stations you most frequently pass.