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The straight through lanes in the diagram has two lanes for each direction, but the flat intersectio¡¦ Many intersections provide crosswalk for pedestrians to cross the road. Paths of the vehicles making left turns and those making right turns cross each other. How are U-turns made? Does the upper roundabout have to be larger than the lower roundabout?

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The TLSI is to be presented at the 87th annual meeting of the Transportation Research Board in Washi¡¦ Roadnext will be participating in "INFRATECH 2006" A paper on TLSI is published in the Journal of Korean Society of Civil Engineers. Patent grant in Canada!! ¡®Related Information¡¯ menu added

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The paper was published in the Journal of Korean Society of Civil Engineers. Application and Evaluation of Two-Level Roundabout Variations on the two-level signalized intersection on the four-point intersection Five-point intersection application of Two-Level Signalized Interchange