摘要：AbstractFour-year accident data of Colorado Interstate highways is studied to investigate the injury severity of accidents occurring on mountainous highways (MT) and to compare the difference with non-mountainous highways (NM) by using mixed logit models. Injury severity from accidents occurring on MT and NM is modeled separately and their respective critical risk factors are evaluated including vehicle, roadway, environmental, driver and accident characteristics. Considerable differences are found existing between the impacts from a variety of variables on the injury severity in MT and NM accidents. Therefore more comprehensive observations can be made by conducting the injury severity study for MT and NM accidents separately. Estimation findings indicate that one indicator and two indicators will be better modeled as random parameters in MT and NM models respectively. As a result, the complex interactions of various variables and the nature of injury severity are able to be disclosed in a better way.
