Abstract
TBD
Phd Dissertation
Development of spatio-temporal accident impact estimation model for freeway accident management
Publication Date
March 27, 2007
Area of Expertise: Infrastructure Delivery， Operations， & Resilience, Safety， Public Health， & Mobility Justice
working paper
Traffic Conditions and Truck Accidents on Urban Freeways
Publication Date
June 30, 2004
Author(s)
working paper
Safety Aspects of Freeway Weaving Sections
Publication Date
July 31, 2003
Author(s)
Abstract
One source of vehicle conflict is the freeway weaving section, where a merge and diverge in close proximity require vehicles either entering or exiting the freeway to execute one or more lane changes. Using accident data for a portion of Southern California, we examined accidents that occurred on three types of weaving sections defined in traffic engineering: Type A, where every merging or diverging vehicle must execute one lane change, Type B, where either merging or diverging can be done without changing lanes, and Type C, where one maneuver requires at least two lane changes. We found no difference among these three types in terms of overall accident rates for 55 weaving sections over one year (1998). However, there were significant differences in terms of the types of accidents that occur within these types in terms of severity, and location of the primary collision, the factors causing the accident, and the time period in which the accident is most likely to occur. These differences in aspects of safety lead to implications for traffic engineering improvements.
working paper
Public Works, the Courts, and the Consent Decree: Environmental and Social Effects of the “Freeway With a Heart”
Publication Date
December 31, 1996
Author(s)
Abstract
Transportation planning in the United States has undergone a revolution in the past two decades. As recently as the late 1960s, with little citizen participation apart from public hearings on specific routes (Rosener, 1975), technical experts laid out plans for major transportation facilities, and their agency colleagues implemented those plans through standard routines. These routines often included noncontested condemnation and considerable alteration of the physical environment.
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An Analysis of the Severity and Incident Duration of Truck-Involved Freeway Accidents
Publication Date
July 31, 1986
Author(s)
Abstract
Data associated with over 9000 accidents involving large trucks and combination vehicles during a two-year period on freeways in the greater Los Angeles area are analyzed relative to collision factors, accident severity, incident duration, and lane closures. Relationships between type of collision and accident characteristics are explored using log-linear models. The results point to significant differences in several immediate consequences of truck-related freeway accidents according to collision type. These differences are associated both with the severity of the accident, in terms of injuries and fatalities, and the impact of the accident on system performance, in terms of incident duration and lane closures. Hit-object and broadside collisions are the most severe types in terms of fatalities and injuries, respectively, and single-vehicle accidents are relatively more severe than two-vehicle accidents. The durations of accident incidents are found to be log-normally distributed for homogeneous groups of truck accidents, categorized according to type of collision and, in some instances, severity. The longest durations are typically associated with overturns.