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Publication Number: FHWA-HRT-10-052
Date: June 2010
Factors Contributing to Pedestrian and Bicycle Crashes on Rural Highways
FHWA Contact: Carol Tan, HSIS Program Manager,
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Approximately 25 percent of nationwide pedestrian and bicycle fatal and injury accidents occur on rural highways. In contrast to urban highways, rural highways have certain characteristics that can be more hazardous to pedestrians and bicyclists, such as higher average vehicle speeds and a lack of sidewalk provisions. Limited research has been conducted on rural highways, where crash types have been defined with more detailed coding than exists on standard police forms and where crash data could be linked with roadway characteristics and traffic counts.
The goals of this study were to examine the differences between pedestrian and bicycle crashes in urban and rural settings in North Carolina and to identify problem areas (specific crash types and crash locations) on rural highways that are of high priority for safety treatment and treatment development.
A 1996 study analyzed 5,000 pedestrian and 3,000 bicycle-vehicle crashes from five States.(1) This study used a crash-typing method developed by the National Highway Transportation Safety Administration to refine and update crash type distributions. The most common crash types were midblock dart/dash, other midblock, intersection-related, and vehicle turn/merge. The majority of bicycle-vehicle collisions occurred when the parties were crossing paths, and they were usually due to a failure to yield. The most common crossing-path crash types were drivers failing to yield, bicyclists failing to yield at an intersection, and bicyclists failing to yield midblock.
A recent review by Campbell, Zegeer, Huang, and Cynecki considered over 200 studies pertaining to pedestrian safety.(2) They found that while pedestrian crashes predominantly occur in urban areas, pedestrian crashes in rural areas more often lead to pedestrian deaths, possibly due to higher vehicle speeds. Pedestrian groups that were overrepresented were young pedestrians, pedestrians who had consumed alcohol, and older pedestrians. The most common crash types were dart-outs, intersection dashes, and turning-vehicle collisions.
Other studies of rural pedestrian crashes found that vehicle type, alcohol involvement, pedestrian age, weather, light conditions, nonintersection location, road curve and grade, and surrounding development type were all prominent characteristics in crash injury and frequency.(3–5)
While the previously mentioned studies examined the general characteristics of rural crashes, there is a need to investigate more detailed crash types and characteristics of rural pedestrian and bicycle crashes to determine potential treatments. This study explored these issues and addressed the role of countermeasures in rural environments.
This study used data from pedestrian and bicyclist crashes in North Carolina and linked them with roadway data from the Highway Safety Information System (HSIS).(6) A subset of the North Carolina crash data were linked to urban and medium-to-high volume rural roadway data in HSIS to provide the dataset used in this study, which spans from 1997 to 2002. The data comprise 1,849 total bicycle-vehicle crashes (52 percent rural crashes and 48 percent urban crashes) and 3,598 pedestrian-vehicle crashes (54 percent rural crashes and 46 percent urban crashes).
GENERAL COMPARISON OF RURAL AND URBAN CRASHES
The first objective of the study was to compare general descriptive statistics of rural versus urban crashes. This general comparison is useful for indicating which factors are common to both localities as well as which factors are overrepresented in a rural environment. The rural to urban crash comparison can be found in table 1.
Table 1. General comparison of rural and urban crashes.
The most common crash types for bicyclists differed in rural and urban areas. The most common rural crashes included bicyclists turning/merging into the path of the driver and drivers overtaking the bicyclist. The most common urban crashes included drivers failing to yield, bicyclists failing to yield midblock, and bicyclists failing to yield at the intersection. One noticeable difference is that common rural crash types generally occurred at midblock segments, while urban crash types generally occurred at intersections.
Both rural and urban areas had the same top four most common pedestrian crash types: (1) pedestrians walking along the roadway, (2) pedestrians failing to yield, (3) miscellaneous, and (4) pedestrians darting/dashing midblock. Similar to the comparison of bicycle crash types, the most common rural pedestrian crash type (pedestrians walking along the roadway) was more common at midblock segments, whereas the most common urban crash type (pedestrians failing to yield) was mostly found at intersections.
EXPLORATION OF FACTORS IN RURAL CRASHES
The second objective of this study was to identify specific crash types and crash locations on rural highways that are of high priority for safety treatment and treatment development. This section examines rural crashes according to road class and crash type to identify problem areas. It also examines prominent characteristics of those problem areas.
Analysis of Rural Crashes by Road Class
Given the availability of roadway inventory data in HSIS, it was possible to examine rural pedestrian and bicycle crashes with respect to characteristics of the roads where they occurred. The roadway-miles and vehicle-miles in table 2 and table 3 are a statewide reflection and do not simply represent roads where crashes occurred.
Roads in rural areas were divided into classes according to number of lanes, level of access control, and other characteristics. It should be noted that 94 percent of North Carolina State-owned roads are rural two-lane roads.
Table 2. Rural bicycle crashes by road class.
Table 3. Rural pedestrian crashes by road class.
For bicycle crashes, crash frequency and crashes per vehicle-mile indicate that rural two-lane roads had the highest number of crashes, even after vehicle exposure was accounted for. The crashes per roadway-miles indicate that rural multilane undivided nonfreeways would be the most cost-effective roadway class to treat on a per-mile basis.
For pedestrian crashes, crash frequency indicates that rural two-lane roads had the highest number of crashes. Crashes per roadway-mile indicate that rural multilane undivided nonfreeways would be the most cost-effective roadway class to treat on a per-mile basis. Crashes per vehicle-mile indicate that rural two-lane roads and rural multilane undivided nonfreeways had the highest number of crashes.
Overall, the rural two-lane roads class had the greatest need for safety improvements due to the large number and rate of crashes that occurred on these roads. While it is true that it would be costly to treat the extensive mileage of rural two-lane roads, funds for safety research and treatment development would be better spent if focused on this roadway class, and the treatments could be targeted to certain locations or segments within this class.
The lack of pedestrian and bicyclist volume data prevents researchers from knowing whether the crashes are distributed evenly in accordance with where people walk and ride or if they are disproportionately represented on certain road classes. However, given the available data on crashes and vehicle volumes, the North Carolina data indicate that treatments for rural pedestrian and bicycle crashes should focus on two-lane roads.
Analysis of Rural Crashes by Crash Type
One of the most prominent features of the North Carolina pedestrian and bicycle crash database is the crash type data. Based on police crash report sketches and narratives, each crash is categorized as a particular crash type, such as drivers overtaking a bicyclist or pedestrians walking along the roadway. This study explored crashes according to type and road class. Frequently occurring combinations of crash type and road class were identified as problem areas (e.g., pedestrians walking along the roadway on rural two-lane roads or drivers overtaking a bicyclist on rural two-lane roads). These problem areas were then explored to determine recurring crash characteristics. Pedestrian, bicyclist, driver, environmental, and roadway characteristics of the problem area were compared to the characteristics of all crash types on that road class (e.g., all crash types on rural two-lane roads). This comparison indicated which characteristics were overrepresented in that problem area. Any overrepresentation of a particular characteristic indicated potential treatment areas. For example, if characteristics of a problem area indicated that younger pedestrians were more involved than the general distribution, treatments specific to younger pedestrians would be more appropriate for improving the problem area.
The characteristics of each problem area were compared to the characteristics of all crash types on that road class to determine how they differed. This study examined each of the 11 pedestrian problem areas and 5 bicycle problem areas. An example problem area (walking along roadway crashes on rural two-lane roads) has been included to show the results of the examination of the characteristics of the pedestrian, driver, environment, and location.
Example Examination of Problem Area Characteristics
Comparison of pedestrian walking along the roadway to all pedestrian crash types.
Discussion of Countermeasures for Rural Problem Areas
After the problem areas were identified, potential countermeasures were discussed to reduce those types of crashes. The Federal Highway Administration (FHWA) has sponsored two projects, PEDSAFE and BIKESAFE, to provide comprehensive information on pedestrian and bicyclist safety, specifically focusing on crash types and countermeasures.(7,8) This current study examined crash types from pedestrian and bicyclist problem areas, considered the countermeasures that PEDSAFE or BIKESAFE suggests for that crash type, and discussed the suitability of the countermeasure with respect to the rural setting. Through careful consideration and discussion with a limited group of pedestrian and bicycle experts who were involved in the development of PEDSAFE and BIKESAFE, the suitability of the countermeasure for rural settings was given a consensus-based rating for two measures—the potential safety effectiveness of the countermeasure and the feasibility of its implementation in rural areas.
Summary of Countermeasure Discussion
The countermeasures that rated high for potential safety effectiveness and feasibility in rural areas for each crash type are listed below. Pedestrian and bicyclist activity can be relatively low on some rural roads. Thus, certain countermeasures (indicated in the following list with the word "targeted") may only be suitable for rural areas where there are higher levels of pedestrian and bicyclist activity. Note that a full discussion of possible treatments, including those not considered feasible, is in the final report (Transportation Research Board Annual Meeting 2007 Paper #07-2457).
Rural pedestrian crash types and their solutions include the following:
Rural bicycle crash types and their solutions include the following:
The goal of this study was to gain additional knowledge on rural pedestrian and bicycle crashes. A general comparison of rural and urban crashes in North Carolina found that rural crashes were typified by higher fatality rates, higher vehicle speeds, less roadway lighting, unpaved shoulders, and more nonintersection locations than urban crashes.
An examination of rural crashes by road class showed that rural two-lane roads had the greatest needs for safety improvements due to their high raw crash frequencies and crash rates per vehicle-mile.
Specific problem areas were identified and described in terms of characteristics of the crash participants and crash location. The study identified 11 pedestrian problem areas, such as walking along roadway crashes on rural two-lane roads, and 5 bicycle problem areas, such as bicyclists turning/merging into the path of drivers midblock on rural two-lane roads.
Potential countermeasures for these problem areas were discussed to determine their potential safety effectiveness and feasibility for rural areas. Potential pedestrian crash countermeasures for rural areas included improving roadway lighting, educating pedestrians and drivers, and adding sidewalks and paved shoulders. Potential bicycle crash countermeasures for rural areas included providing marked pavement space for bicyclists, adding paved shoulders, and improving roadway lighting.
This study was sponsored by the FHWA under HSIS project DTFH61-00-C-00034. The authors appreciate the support of HSIS Manager Carol Tan, Office of Safety Research and Development and the Office of Safety, in defining the scope of the study and for reviewing preliminary versions. They also express their appreciation to Charlie Zegeer and Bill Hunter of the University of North Carolina Highway Research Safety Center for their input on pedestrian and bicycle countermeasures.
FOR MORE INFORMATION
Additional information can be found in the full report that was presented on this study. It can be obtained as follows:
Carter, D. and Council, F. (2007). Factors Contributing to Pedestrian and Bicycle Crashes on Rural Highways, Transportation Research Board 86th Annual Meeting Paper #07-2457, Transportation Research Board, Washington, DC. Obtained from: http://tris.trb.org/view.aspx?id=802225.
The full report can also be found at www.hsisinfo.org.
For more information about HSIS, contact Carol Tan, HSIS Program Manager, HRDS, (202) 493-3315, firstname.lastname@example.org.