The overpass project – a case study of community action When the NYC DOT planned to fortify the parkway’s ornamental bridges according to current safety standards, it proposed covering the stone walls of the Parkway’s overpasses in Riverdale with concrete topped with chain link. Alerted by the Preservancy, the Art Commission of the City of New York pressed DOT to come up with a design worthy of the picturesque parkway and Riverdale. The compromise design, while far from perfect, preserved the traditional stonework and wooden fencing.