Keep an eye on those icons

So I booked a Choice Hotel room this weekend, and being a non-smoker, selected a non-smoking room, as identified by this icon:

smoking1.gif

Except … that wasn’t the no-smoking icon. This is the no-smoking icon:

non-smoking.gif

Given the choice of millions of colors, why on earth would they reuse red?  Why not, oh, say, red and green?

Question: are any icons on your site ambiguous?