Not for driving within WA. WA manages fatigue through its own work health and safety laws, and while work diaries aren't required there, businesses must keep a record of each driver's work time, breaks and non-work time. Logmaster keeps that record against the driver's WA plan. Once a truck over 12 tonnes, or a bus built for more than 12 adults, is driven outside WA and the NT, the HVNL work diary rules apply, and the driver can use the written National Driver Work Diary or an NHVR approved EWD such as Logmaster.