n.a transverse and totally enclosed drain under a road or railway

Apparatus for thawing frozen culverts
Drainage culverts as habitat linkages and factors affecting passage by mammals
FISH PASSAGE THROUGH CULVERTS, ROCK WEIRS AND ESTUARINE OBSTRUCTIONS
Landscape-level stream fragmentation caused by hanging culverts along ...
Cutting the carnage: wildlife usage of road culverts in north-eastern New South Wales
The Effect of Roads, Barrier Fences, and Culverts on Desert Tortoise Populations in California, USA
Permeability of roads and railways to vertebrates: The importance of culverts
Effectiveness of a barrier wall and culverts in reducing wildlife mortality on a heavily traveled highway in Florida
A simple contact–friction interface element with applications to buried culverts
Response of carnivores to existing highway culverts and underpasses: implications for road planning and mitigation