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Trans. Planning Journal
| Title | A STUDY ON AMBER-LIGHT DURATIONS UNDER VARIOUS VEHICLE ARRIVAL TYPES |
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| Author | Shu-Keng Hsu, Lawrence W. Lan |
| Summary | This paper aims to compare the amber-light durations determined by two approaches: the cumulated stopping probability (CSP) approach proposed by Lin et al (1987, 1988) and the aggregated stopping possibility (ASP) approach proposed by Hsu and Lan (2003). We demonstrated with an example and discovered that the CSP approach worked well under single-vehicle arrival condition, but it overestimated the desired amber duration under multi-vehicle arrival condition; in contrast, the ASP approach worked well for both circumstances. We further conducted a field case study in Taipei. The results show that, under various types of vehicle arrivals, the CSP approach leads to diversified cumulative stopping probability curves of desired amber durations, however the ASP approach comes out with rather consistent results. From the field study, more red light runners (violators) are observed at the end of the amber light cycle under multi-vehicle arrival condition than single-vehicle arrival condition. Therefore, this study proposes a design of fixed length of the amber light and varied length of the red light that can be adjusted according to such factors as intersection width, approaching speed and vehicle arrival typesat the light change. |
| Vol. | 36 |
| No. | 2 |
| Page | 209 |
| Year | 2007 |
| Month | 6 |
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