1. Introduction and Overview. 2. Detecting Influential Observations and Outliers. 3. Detecting and Assessing Collinearity. 4. Applications and Remedies. 5. Research Issues and Directions for Extensions. Bibliography. Author Index. Subject Index.

Regression Diagnostics: Identifying Influential Data and Sources of Collinearity

Characteristics of traffic crashes among young, middle-aged, and older drivers.

Fatal crash risk for older drivers at intersections.

Transport mobility benefits and quality of life: A time-use perspective of elderly Canadians

This report presents information on the characterization of cementitiously stabilized layers and the properties that influence pavement performance. It also contains recommended performance-related procedures for characterizing these layers and performance-prediction models for incorporation into the mechanistic–empirical pavement analysis methods. Individual chapters highlight pavement distresses of hot-mix asphalt pavements and concrete pavements, laboratory tests and model development, and model calibration. The material contained in the report will be of immediate interest to state materials, pavement, and construction engineers and others involved in the different aspects of pavement design and construction.

Characterization of Cementitiously Stabilized Layers for Use in Pavement Design and Analysis

Truck axle configurations and weights have changed significantly since the AASHO road study was conducted in the late 1950s and early 1960s. Emerging concerns about the effects of new axle configurations on pavement damage, which is unaccounted for in the AASHTO procedure, have prompted several researchers to investigate the impacts of different axle and truck configurations on pavement performance. However, there is still a need to strengthen the mechanistic findings using field data. In this paper, actual in-service traffic and pavement performance data for flexible pavements in the state of Michigan are considered. Monitored truck traffic data for different truck configurations are used to identify their relative damaging effects on flexible pavements in terms of cracking, rutting, and roughness. The analysis included simple, multiple, and stepwise regression. The results indicated that trucks with multiple axles (tridem or more) appear to produce more rutting damage than those with only single and tandem axles. On the other hand, trucks with single and tandem axles tend to cause more cracking. Pavement roughness results did not show enough evidence to draw a firm conclusion.

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Effect of Heavy Multiple Axle Trucks on Flexible Pavement Damage Using In-Service Pavement Performance Data

Studies of age differences in motion perception abilities and accident involvement patterns are reviewed to predict the exaggerated difficulty for older drivers with specific traffic maneuvers and the expected ordering of older-driver accident involvement rates by type of maneuver. A rigorous analysis of police-reported accidents in Michigan and Pennsylvania used induced exposure methods to demonstrate the highest older-driver accident involvement rate for turning left against oncoming traffic; the next highest older-driver accident rate occurred when drivers were crossing or turning into a traffic stream, although the extent of overinvolvement was not as high as the first situation; and the lowest relative involvement rates for maneuvers in which an age-related motion perception deficit may be at issue were in situations in which vehicle headways are critical, such as overtaking. Mitigating factors such as older drivers' slower driving that may compensate for or minimize some of the problems found in laboratory tests are noted. Overall, the present review and analysis supports an interpretation that age differences in motion perception in critical traffic situations is an important factor in older drivers' overinvolvement in particular accident types.

Age differences in motion perception and specific traffic maneuver problems

Quasi-induced exposure revisited.

A review of the validity of the underlying assumptions of quasi-induced exposure.

Transportation has been one of the essential areas within civil engineering since its early days. In commemoration of the 150th anniversary of ASCE, this paper presents a review of developments in research, education, and practice in transportation engineer- ing. The review is based primarily on the issues of the Journal of Transportation Engineeringover the past several decades. Main topics include transportation engineering practice, airport and highway pavements and materials, design and safety, planning and operations, pipelines, technology, and education. Historical appraisals and the current state-of-the-art for these topics are discussed. In conclusion, future directions in transportation engineering as a result of advances in technology and the attendant changing need of the transportation engineering profession in the 21st century are addressed.

Richard W Lyles

Papers

Effect of Heavy Multiple Axle Trucks on Flexible Pavement Damage Using In-Service Pavement Performance Data

Age differences in motion perception and specific traffic maneuver problems

Quasi-induced exposure revisited.

A review of the validity of the underlying assumptions of quasi-induced exposure.

Development of Transportation Engineering Research, Education, and Practice in a Changing Civil Engineering World