Does your company cover taxi costs?
Traveling around Sydney can take time and your time is best spent doing billable work in the office or at a client site. Taking a taxi is perfectly acceptable, if it is going to save substantial time, compared with taking public transport.
This is applicable to travel between client sites or the office and a client site. Work does not pay for taxi travel from home to a client site, or home to the office. Remember to always obtain a Tax Invoice from the taxi driver so you can request for reimbursement later on.