A Google Scholar search using the term “vertebrate roadkill
survey” provided 1450 results. The first 10 pages were
reviewed to locate peer-reviewed journal articles which
assessed roadkill detection. We did not constrain the
search by geographic location or to cover a particular period
and located 61 peer-reviewed roadkill studies that
monitored roadkill from a vehicle. For each of the 61
studies, we extracted the following information: speed driven,
when transects were driven, direction travelled, number
of observers, sampling distance, frequency, and
duration of sampling (Appendix S1) with each of these
summarized as a mean and median