Don't worry about that.I assure most of them can read pinyin.Can you speak pinyin by the way?If you can,Just speak it our to taxi drivers.They are not too stupid to get your meaning.Good luck.

If he could read pinyin he wouldn't be a taxi driver.

I think it is no problem for every chinese driver to read in Pinyin if the man had experienced school life, because it is first lesson for pupils.

I think that depends on the age of the taxi driver.Generally speaking,people under age of 35 can read the address in Pinyin.

I think most of them can read an adress in PINYIN . because pinyin is the common sense