Keywords: 13, access, barrier, biological conservation, bridge, Chesapeake Bay, Chesapeake Bay Bridge–Tunnel, collisions, conduit, connectivity, corrugated, dead, diamondback terrapin, fence, Fisherman Island, highway, hwy, intergrated, Malaclemys terrapin, Malaclemys terrapin terrapin, measure, measures, mitigation, mortality, National Wildlife Refuge, Northern diamondback terrapin, pipe, pipes, plastic, PVC, rebar, Refuge, road, roadbed, stake, stakes, terrapin, traffic, transportation, tube, Tunnel, turtles, United States Fish & Wildlife Service, US Hwy 13, USFWS, vehicles, Virginia, wall, wildlife