Mr. Graham Doyle:

We are going to make a massive investment in alternative fuel buses. We will invest in 500 vehicles in the coming years, which is a massive investment. We need to learn what we can from where some of these technologies are operated elsewhere. The Senator is absolutely right when he says the technology has been changing and improving. We are aware that there are different conditions, depending on how bus fleets operate or are deployed in various cities. That can have an impact, but we have committed to not buying any more diesel-only urban buses from mid-2019. As there is a date on it, it is an action point. Testing is absolutely the right thing to do from a variety of perspectives, particularly climate change. There is also value for money to achieved in lots of other things.