You can claim a deduction for travel expenses if you are required to travel overnight to perform your work duties. ‘Overnight’ can be taken to mean a mandatory rest break after being on duty and before recommencing duty, that is of sufficient length for you to sleep (around 7 hours or more), and would usually involve you taking up accommodation for that purpose.
Travel expenses could include meals, accommodation, fares and incidental expenses that you incurred and your employer has not provided or reimbursed you.