A New Caledonia No-Bikes-Allowed “What am I?” Quiz

Panasonic LX100 at an effective 46mm — 1/200 sec, f/5.6, ISO 200 —
map & image data — nearby photos

What Do I Mean?

クイズ：このニューカレドニアの交通標識はどういう意味でしょうか？

road sign in Nouméa, New Caledonia

Driving around during our vacation in New Caledonia, I came across a
number of road signs whose meaning was not intuitive to me, including the one above. I thought it might make a good “What am I?” quiz.

The sign obviously doesn't mean “No Bicycles Allowed” or I wouldn't be posting it here.... unless, of course, I'm doing the
whole reverse-psychology thing to fake you out. But then again, I may well be doing the whole reverse-reverse-psychology
thing to fake you into thinking I'm trying to fake you out.

Frankly, I'm so confused now that I don't even know. Anyway, what do you think the sign means?

As is usual with these quizzes, I'll hold all guesses privately until I publish the answer in a day or three.