Can a "welfare taxi ticket", "car fuel ticket for disabled people" and "Keiro pass" be used together?

It cannot be used together. It has one of the options.
If you have received a welfare taxi ticket or a car fuel ticket for disabled people and wish to receive a Keiro Pass, please return the rest of your welfare taxi ticket or car fuel ticket for disabled people to Elderly and Disabled Support Division or Children and Families Support Division at your ward office.
In addition, we send guidance of Keiro Pass to person who received welfare taxi use ticket or person with a disability car fuel ticket, but choose welfare taxi use ticket or person with a disability car fuel ticket sequentially If you do, you cannot apply for Keiro Pass.