What type of amphibian tunnel could reduce road kills?

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Roadkills of vertebrate species on two highways through the Atlantic Forest Biosphere Reserve, southern Brazil (2008, background): “…15007, 90501-970 Porto Alegre, RS, Brazil e-mail: andreas.kindel@ufrgs.br A. V. P. Coelho Laboratório de Microeletrônica, Instituto de Física, UFRGS, Porto Alegre, RS, Brazil 1995; Clevenger et al. 2002; Lesbarrères et al. 2004; Clevenger and Waltho 2005) are now discussed more than in the past.”
Road-Crossing Structures for Amphibians and Reptiles: Informing Design through Behavioral Analysis (2007, result): “…influenced their preference against concrete and PVC. Similarly, a previous study found that agile frogs (Rana dalmatina) and water frogs (Rana esculenta) were more likely than common toads (Bufo bufo) to choose a tunnel lined with soil over a substrate of bare concrete (Lesbarreres et al., 2004).”