| Summary |
Chu-you Chen，2007.06
Feng Chia University
After the construction of vertical Freeway III and twelve horizontal expressways are completed, a whole high-speed highway network is almost ready for route choices among a variety of travelers. However, due to different periods of formulated time between Freeway I and III, the goals of planning these freeways and the backgrounds of two road user groups also depart from each other, thus, resulting in two traffic conditions. If more valid and precise information regarding where are congested is provided, hopefully, relevant kind of road guidance can attain suitable function of the network, i.e., help relieve traffic problems, which in turn, decrease travel costs, time, or fuel consumption.
This research is based on a framework of intelligent transportation system, it tries to collect required data at several specific pre-determined locations through vehicle detectors, there are then ending up with cases for 9 incidents to be compared to their baseline data matched with days and time of a day. Three traffic quantity upstream volume, downstream volume and the ratio of the second to the first volume are tested between incidents and baselines, and significant results reveal the reasons of difference from effects of possible factors, such as time of a day, which days, number of concurrent showing of changeable message sign (CMS), different incident types, different car platoon length of congestion. Outputs from a series of statistical analyses indicate the effects of display contents (e.g., number of blocked lanes and distance from the location of display to location of an incident) are influential, and they are quite expected results.
The purposes of this study aims at exploring practical tasks of data gathering systems by a process of testing, analyzing and discussing, as well as investigating working conditions of a incident response system and information conveying format of its display system. More importantly, how display strategies affect drivers’ behaviors after reading CMS and related concluding remarks are summarized and used as a reference for planning countermeasures based on traffic controls by the traffic management agents of freeway systems. |
