A local advocacy group I work with is attempting to get the city of New Haven to place "Yield to Pedestrians in Crosswalk" (the temporary devices listed in the MUTCD) signs placed at various intersections throughout the city. The response we get from the city is that they can't or won't do it because of liability issues (i.e. cars hitting the signs). Numerous other towns and cities in the area use these signs without problems. Has anyone else faced this issue? How have you dealt with it? Are these liability issues real, and if so are they serious?