The question arises why the string 150 black cab drivers has these two interpretations. Are all strings of words necessarily ambiguous in this way? If not, what is the cause of the ambiguity of this example? Could it be the word cab, another word for taxi, that causes the ambiguity?The string remains ambiguity even if we replace the word cab with the word taxi.Then does the presence of the numeral 150 have anything to do with the ambiguity? Or could the ambiguity be due to the fact that the noun driver is in the plural?Neither.Can we reword the string and make it unambiguous?Yes! (150 drivers of black cabs)