The Arborway, designed in 1892, was constructed as one of four connecting parkways within the Emerald Necklace, alongside the Fenway, Riverway, and Jamaicaway. In its original configuration, the Arborway included a total of seven lanes, with three designated for walking, two for carriages, one for riding, and one for driving. However, changing preferences in transportation altered this layout to benefit automobiles. The modern Arborway contains up to six lanes of traffic, with three to four express lanes and two local lanes running continuously along its length. In 1953, the Casey Overpass was constructed and opened to carry the Arborway over Forest Hills' many roads and transit infrastructure. The momentum has since shifted towards a more accessible and multimodal Arborway. Community groups began to advocate for replacing the Casey Overpass with an at-grade alternative, and in 2010, the Massachusetts Department of Transportation declared the bridge structurally deficient. The Overpass was demolished in 2015 and replaced with extensive multimodal infrastructure, including seven miles of bike paths, a new entrance to the MBTA Orange Line Station at Forest Hills, a new bus terminal at Forest Hills, as well as more than 500 new trees. Additional improvements to the Arborway, including a top-to-bottom multimodal reconfiguration of the parkway, are currently under design.