Crosswalks affect vehicular traffic for one of the north-south road and east-west road.
(Since it is a two-level intersection, the other direction is in the same direction as the affected main road)
This case assumes the crosswalk is on the east-west main road. |
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| Under such condition, crosswalk can be installed in the following manner. |
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| 1. Pedestrian waiting area in the center divider section of the main road. |
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| A. Crosswalk in front of the COEX in Samsung-dong, Seoul. |
B. Crosswalk in the Garak Market Intersection in Seoul [Photograph] |
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| 2. Crosswalk without pedestrian waiting area in the center divider. |
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| In this case, the two-phase signal system in the two-level intersection is changed to three-phase signal system by adding another phase of signal for pedestrians. Furthermore, SPUI (Single Point Urban Interchange) becomes a four-signal road by adding a signal phase for pedestrians.
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In the above system, the walk signal for pedestrians could be operated for every signal cycle, but
It can be operated every 1.5 cycle (left turns – bi-directional straight through – left turns) or,
It can be operated every 2 cycle (left turns – bi-directional straight through – left turns – bi-directional straight through). |
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Therefore, it is our position that the TLSI provides more effective traffic flow than the SPUI (Single Point Urban Interchange) currently under use.
Some of this has been confirmed with TSIS data, and further analysis in progress. |
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