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Providing evidence to improve practice

Individual study: Evaluation of S.R. 46 wildlife crossing in Lake County, Florida

Published source details

Roof J. & Wooding J. (1996) Evaluation of S.R. 46 wildlife crossing in Lake County, Florida. Florida Game and Fresh Water Fish Commission report.


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Install barrier fencing and underpasses along roads Terrestrial Mammal Conservation

A before-and-after study in 1993–1995 of a highway in Florida, USA (Roof & Wooding 1996) found that an underpass beneath a highway, in an area with roadside fencing, was used by mammals but the road-kill rate was not reduced. Nine mammal species used the crossing. Most crossings were by rabbits Sylvilagus palustris (69 crossings), racoons Procyon lotor (61), armadillos Dasypus novemcinctus (36), opossums Didelphis virginiana (36), foxes Vulpes vulpes (29) and bobcats Lynx rufus (27). The number of mammals of squirrel size or larger killed on the fenced road section was not significantly different in the 11 months after fence installation (13 animals) relative to the 11 month before (10 animals). A wildlife crossing (14.3 m long, 7.3 m wide and 2.4 m tall) was constructed under the two-lane highway between summer and December 1994. A 3-m-high fence extended along both sides of the highway, 0.6 km in one direction and 1.1 km in the other. Underpass use was determined in December 1994 to December 1995 by footprint surveys and by using a motion-triggered camera. Road-kills were surveyed three times/week from November 1993 to December 1995.

(Summarised by Nick Littlewood)