sarebbe un cartello a cavalletto che si mette sulla strada

Explanation:
Essentially, a 'stop-trottoir' is what you will find outside a bar, restaurant or shop. It is not fixed to the pavement or wall. It is put in the way of pedestrians so you either see and read the sign or fall over it. The shape can be an ‘A’ frame ‘chevalet’ or a weighted bendy sign. All of them are designed to blow over in high winds, frighten horses and attack stationary cars. We have a complete obstacle course of ‘stop- trottoirs’ in our town.

Questo termine è abbastanza diffuso in italiano per insegne pubblicitarie da marciapiede che io terrei come alternativa in quanto sinonimo ma con meno ricorrenze