Journal of Korean Society of Transportation ISSN:1229-1366(Print) 2234-4217(Online) 대한교통학회지

Arterial is the road with the highest mobility hierarchy on the urban street, and the signal operation sector has found several signal design theories to ensure the continuous flow of the through vehicles in the main road. However, despite the various bandwidth studies going on, few studies have been done on measures to assess the efficiency of applied signal time. With the recent establishment of a precise data collection environment, various traffic data has been accumulating in real time. Accordingly, this study used the collected traffic data to design a new bandwidth efficiency evaluation index that redeem the limitations of existing index. The new bandwidth efficiency index was designed with emphasis on ‘individual vehicle speed’ and ‘the number of stops’ to reflect the actual traffic flow. The appraisal standard for the new index was based on the time-space diagrams expressed using the two-second car trajectory data. The practicalness of this index was confirmed by comparing the existing bandwidth efficiency index calculated using KS-Signal, a signal progression optimization program. Since this study only dealt with one-way bandwidth optimization, it is expected that more realistic results will be obtained when two-way optimization is applied to this bandwidth efficiency index later. In addition, the bandwidth efficiency index and the car trajectory graph expressed with the signal time are deemed to be available as a basis for verification and improvement of signal TOD.