Effect of Ramp Type and Geometry on Accidents PDF Download

Author: Ahmad Khorashadi
Publisher:
ISBN:
Category : Express highways
Languages : en
Pages : 140

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Book Description
Accident rates (fatal, fatal plus injury, total, wet, and dark) were analyzed using analysis of variance (ANOVA) and analysis of covariance (ANCOVA) methods. The analyses were intended to look at the systematic differences in accident rates between ramps of different design, stratified by whether a ramp was in a rural or urban area, as well as whether it was an on-ramp or an off-ramp. Finally, a series of ANCOVA models was run, again stratified by rural/urban and on/off-ramp status, which included the measured ramp traffic volume as a covariant, and ramp configurations were noted to assess the differences between pairs of ramp configurations with respect to accident rates. The statistical analysis of accident data and findings are presented along with the findings of other literature to provide an update to a previously published report entitled "The Effect of Ramp Type and Geometry on Accidents" (1966), second edition, R.A. Lundy, published by the Traffic Department, Division of Highways, Department of Public Works, State of California