Good idea, but for me too often you take a transport car and pay with crypto what is excessive while the fiat money in your pocket is spent on more expensive goods. For me it's not a problem, but how about paying with fiat directly it's easier for you to put it next to the driver and leave.
Indeed, it was easier to pay fiat money directly than to pay with crypto. It's a hassle to pay with crypto when you are riding on a car or bus or any transport because you need to make transactions everytime you pay and you need to have internet connection everytime you ride. Then, everytime you made a transaction there is a high transaction fee which is not good, I think.