Publication Detail
Analysis of a Driver En-Route Guidance Compliance and Driver Learning with ATIS Using a Travel Simulation Experiment
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UCD-ITS-RR-97-12 Research Report |
Suggested Citation:
Chen, Wan-Hui and Paul P. Jovanis (1997) Analysis of a Driver En-Route Guidance Compliance and Driver Learning with ATIS Using a Travel Simulation Experiment. Institute of Transportation Studies, University of California, Davis, Research Report UCD-ITS-RR-97-12
The Institute of Transportation Studies at the University of California, Davis has been studying the effects of Advanced Traveler Information Systems (ATIS) on travelers' route choice behavior. One study done by Vaughn et al. in 1994 examined drivers' route choice behavior by means of a travel simulation experiment. In the experiment, subjects were asked to travel from an origin to a destination on a hypothetical network. There were 20 sequential trial days and traffic conditions were varied over these 20 days. Ninety-nine subjects were recruited for this experiment.
In the study by Vaughn et al., the dependent variable of interest was the choice of path (or route) for each day, and the paths were defined by the sequence of links. In total, 48 different routes were traveled. The 10 most frequently used routes were employed to investigate subjects' route choice behavior. The route choice study in this report uses the same data set collected from the travel simulation experiment. Instead of exploring the choice behavior for the entire route in each day, this study investigates influential factors affecting drivers' compliance with en-route guidance advice at intersections.
In the experiment, en-route guidance is provided when the subject is close to an intersection. The response variable is the choice made at the intersections reached by the subject. The possible influential factors considered in this study consist of en-route guidance characteristics (e.g., whether the advised link is to continue on the freeway or approach the freeway), the subjects' personal characteristics (i.e., age, gender and education level), and whether or not incident information and congestion information are provided. In addition, the subjects' temporal and spatial estimations of the system accuracy are also taken into account. A subject's current decision behavior may be affected by his or her estimation of the accuracy of the en-route guidance system based on their previous experience. To understand the effect of the accuracy of information and the subjects' perception of the accuracy, en-route guidance and congestion information were provided at a level of 75% accuracy.
Since the focus of this study is on decisions at intersections reached by the subject, many observations were made of the same person during the 20 trial days. A repeated measures problem (i.e., the auto-correlation problem in the error term which violates the independence assumption of the response variable) is also considered in this study.
In the study by Vaughn et al., the dependent variable of interest was the choice of path (or route) for each day, and the paths were defined by the sequence of links. In total, 48 different routes were traveled. The 10 most frequently used routes were employed to investigate subjects' route choice behavior. The route choice study in this report uses the same data set collected from the travel simulation experiment. Instead of exploring the choice behavior for the entire route in each day, this study investigates influential factors affecting drivers' compliance with en-route guidance advice at intersections.
In the experiment, en-route guidance is provided when the subject is close to an intersection. The response variable is the choice made at the intersections reached by the subject. The possible influential factors considered in this study consist of en-route guidance characteristics (e.g., whether the advised link is to continue on the freeway or approach the freeway), the subjects' personal characteristics (i.e., age, gender and education level), and whether or not incident information and congestion information are provided. In addition, the subjects' temporal and spatial estimations of the system accuracy are also taken into account. A subject's current decision behavior may be affected by his or her estimation of the accuracy of the en-route guidance system based on their previous experience. To understand the effect of the accuracy of information and the subjects' perception of the accuracy, en-route guidance and congestion information were provided at a level of 75% accuracy.
Since the focus of this study is on decisions at intersections reached by the subject, many observations were made of the same person during the 20 trial days. A repeated measures problem (i.e., the auto-correlation problem in the error term which violates the independence assumption of the response variable) is also considered in this study.