As means to eliminate pedestrian-cyclist conflict on the Prospect Park Drive (“PPD”), it is proposed that DOT grade the eight signaled crossings.

Precedent can be found in Prospect Park’s 1975 application to the Landmarks Preservation Commission:

“The main method used to separate the pedestrian from vehicular traffic is by means of a series of arches at strategic points which carry the drives over the walks. Eastwood Arch, built 1867-68, allowed the pedestrian arriving from the Willink entrance to pass beneath the East Drive and a bridle path into the Nethermead by the Lullwater.” – Presentation for Prospect Park to Landmarks Preservation Commission, 11/25/75. P. 6, https://tinyurl.com/2p8zywy9

Eight signaled crossings on Prospect Park Drive.  Ridewith GPS.

Using the Eastwood Arch as a model, the estimated cost for a pre-fabricated culvert and stone facing from Fort Miller Precast Concrete Solutions would be $200-250K per unit—50% materials/delivery + 50% installation.  Total projected cost for the eight arches would be $1.6-2.0M.

Eastwood Arch in Prospect Park.  Google StreetView.

Adirondack Park Parapet—hand stained replacement for field-place stonewalls. Fort Miller.

Box culvert installed on North County Trailway in Brewster. Fort Miller.

North County Trailway.  TrailLink.

A less expensive method would employ corrugated steel and earthen facing. Estimated cost would be $100K per unit—10% for materials/delivery + 90% installation.   Total cost $800K.

Corrugated steel underpass, Culvert Trail in Aurburn, CA.  Reddit.

Corrugated steel culvert with “landscaped” facing in Aurburn, CA.  tahoefabulous.com

Noting that the PPA spent $500K over five years to renovate the Endale Arch, corrugated culverts could be installed “bare” and then upgraded over time as budget allowed.

Endale Arch. Paul Marinka.