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  [TLSI] Columns appear to be necessary in the middle of the lower level road to support the upper level road, and going straight and making left turns around the columns appear to pose problems in the TLSI.
 
The amount of overlapping road on the TLSI is the width of the lower level road. In other words, the overpass, which forms the upper level road, is only as long as the width of the lower level road.

Regarding this, we are aware that there is a company with technology to build overpasses without support for up to 30 meters in length. The company is called Steel Korea Co., Ltd., and its homepage is www.steelkorea.co.kr. According to the company, building an overpass without support actually saves 1/3 in construction cost, because it can do without supports.
Furthermore, the difference in the company¡¯s technology has been recognized as a new technology, although it is not the first company to build overpass without support.
In other words, building overpasses without support is not new, and Steel Korea currently builds overpass without support near the headquarters of RoadNext.
If you would like more information on this, we could provide you with information on overpasses without support in Seoul, more specifically, those overpasses without support spanning greater than the width of the road.

Furthermore, having supports for the overpass does not pose significant problem. Examples include overpasses at Sadang Intersection in Seoul and the ordinary intersections with overpasses.
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