Abstract
In conducting performance-based design of road, an index of measure-of-effectiveness plays an important role. Currently, travel speed is suggested as the measure-of-effectiveness, because smooth access to activity bases is a purpose of road development, and a dominant factor for smooth movement under the condition if safe driving is guaranteed. However, driver is forced to pay attention and is strained under ever-changing traffic condition to maintain safety. This fact means that the forced efforts for maintaining safety should be evaluated adequately.
This study develops a measure-of effectiveness index for evaluating traffic function of road sections from a view point of accessibility to activity bases. The index is formulated as an aggregated point-basis evaluation focused on both safety and smoothness, The calibration of the proposed model is made by using driver's subjective evaluation data to the driving environment collected from experiments with driving simulator. A procedure to estimate the value of index from traffic counter data is also developed. Through a case study, the proposed index shows a better description ability than those of current measure-of-efficiency index based on travel speed.
