Cover Image

Not for Sale



View/Hide Left Panel
Click for next page ( 64


The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement



Below are the first 10 and last 10 pages of uncorrected machine-read text (when available) of this chapter, followed by the top 30 algorithmically extracted key phrases from the chapter as a whole.
Intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text on the opening pages of each chapter. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

Do not use for reproduction, copying, pasting, or reading; exclusively for search engines.

OCR for page 63
63 States, road networks are extensive and motor vehicle use has datasets of varying qualities and scales. Results from this ef- sharply increased as wild lands are progressively developed fort are intended to help agencies assess the efficacy of their and suburbanized.21,110 Human population growth and its as- current WVC data collection and analytical techniques. The sociated infrastructure expansion, as well as increasing work complements the growing body of research on mitigat- wildlife populations in some areas, have led to greater safety ing road impacts for wildlife and improving highway safety. concerns and the need to develop effective countermeasures Finally, it provides practitioners and managers with methods to mitigate WVCs. In 2002, an estimated 1.5 million WVCs that can be quickly applied to available information and resulted in 150 fatalities and $1.1 billion in vehicle damage in ultimately streamline the delivery of transportation projects the United States.116 in areas where WVCs are a major concern to agencies and Studies have demonstrated that WVCs are not random stakeholders. occurrences but are spatially clustered.190,124,51,134 However, few studies specifically probe the nature of WVC hotspots or their use and application in transportation planning148,136 Research Approach: Methods and Data and few have been spatially explicit. Most have utilized only Mapping Techniques one method of determining hotspot locations. Many of the studies characterizing WVCs have appeared in scientific and The objective of this research was to investigate different management-focused journals, and often include different mapping techniques that can be used to identify WVC conclusions or recommendations for managers to consider in hotspots. The techniques can be categorized as (1) simple designing wildlife-friendly highways.190,124,183,158 However, lack- graphic, visual mapping exercises and (2) modeling of analyt- ing are best management practices for identifying WVC ical techniques used to identify non-random clusters or hotspots based on current knowledge and technology to help aggregations of WVCs. The simple plotting of WVCs can be guide planning and decision making. done in a variety of GIS formats, for example ArcView or Because WVCs represent a distribution of points, clustering ArcGIS, which currently are being used by many transporta- techniques can be used to identify hotspots. Simple plotting of tion agencies. Simple plotting does not require statistical WVC location points can be done in a variety of GIS formats, algorithms or metrics but is based on visual groupings of road- for example, ArcView or ArcGIS77,78 currently being used by kill clusters and decision-based rules of defining hotspots. many transportation agencies. Simple plotting does not Modeling WVCs using clustering mapping techniques is more require statistical algorithms or metrics but is based on visual complicated. The research team evaluated the mapping groupings of roadkill clusters and decision-based rules of techniques in the context of different scales of application defining hotspots. Clustering of WVCs has been correlated to (project-level to state-level analysis) and transportation man- animal distributions, abundances, and dispersal habits and agement concerns (e.g., motorist safety, endangered species road-related factors including local topography, vegetation, management). Different mapping techniques are described vehicle volume and speed, and fence location or type.190,4,47,51 using one dataset, WVCs in the Canadian Rocky Mountains, In this report, the research team investigates various WVC to demonstrate how this readily available information can be hotspot identification clustering techniques that can be used used by transportation agencies to identify collision hotspots in a variety of landscapes, taking into account different scales at different scales of application. Then one clustering tech- of application and transportation management concerns nique (CrimeStat) was selected and hotspot analyses run (e.g., motorist safety, endangered species management). using two different datasets: UVC carcass data from the Using WVC carcass datasets from two locations in North Canadian Rocky Mountains and California Department of America with varying wildlife communities, landscapes, and Transportation (Caltrans) deer carcass data (DVC) from transportation planning issues, the research team demon- Northern California. The following sections describe the strates how this information can be used to identify WVC hotspot patterns/configurations and examine how they may hotspots at different scales of application (from project level differ by species and the two landscape types. to state level analysis). The model-based clustering tech- niques that are demonstrated include a linear nearest neigh- Study Area bor analysis used initially to measure if the WVC locations were random and then Ripley's K statistic, nearest-neighbor Canadian Rocky Mountains. This study took place in measurements, and density measures to identify hotspots. An the central Canadian Rocky Mountains in western Alberta overview of software applications that facilitate these types of approximately 100 km west of Calgary (see Figure 10 in analyses is provided. The information presented in this report Section 3.2). The area encompasses the Bow River watershed is intended to advance understanding of the considerations and includes mountain landscapes in Banff National Park that should be taken into account when analyzing WVC and adjacent Alberta Provincial lands in Kananaskis Country.