Wow, Im pretty sure that anywhere in the world you go and ask a cab driver what bitcoin is, they never heard of it.
I ask about 2 cab drivers a week in New York, and have done since 2013. I have met exactly one who admitted they had heard of bitcoin. This is extremely bullish in the long-term, and very disappointing in the short term. These people should be primary users of bitcoin. Almost all of them are recent immigrants who support families in Asia or Africa via remittances.
Waiting for confirmations makes usage of Bitcoin problematic for taxi driving anyway. Not that it couldn't be done but there need to be other kinds of infrastructure in place for that to work (effectively a Bitcoin credit card or preloaded escrow)