I have shown it to others.
I would not have shown it to others if TAXI had been spelt correctly.
I probably would not have even taken the photo just because of the poor missing apostrophe.
Was it done in error?
Or, was it a smart idea to increase the reach of the marketing?
As I took the photo in May 2011 and as the sign is still on a car spotted in the last few weeks, I suspect the latter.