Prostitutes in the area! Street sign has locals confused in Northern Italian town

The street sign in Treviso that's causing a stir among locals.

Of all the street signs in the world this has to rate as one of the classics.
Inside the red triangle is a picture of a large-breasted woman in a mini skirt and high heels. The wind is blowing in her hair and she's clutching a handbag.
The racy image, however, has been causing some confusion in the city of Treviso in northern Italy.
The sign says "Attenzione Prostitute," but what does that? Several locals have complained that the sign is confusing.
They don't know if it means to watch out for crossing hookers or if it simply means there are prostitutes nearby.

Treviso resident Dino Vezino, 34, said, "I was driving in to work and saw this sign and had to slow down to get a proper look.
"I couldn't believe it - the woman has a mini-skirt and high heels on and very big breasts.
"I just couldn't work out what it was for?
"Does it mean I have to look out for prostitutes crossing or that they are available around here?"