| 摘要 |
<p>A tunnel concave bridge of a traffic pivot system for the concurrent free flow of twelve routes at a cross road is provided. The bridge is composed of a concave lane and an arch bridge so as to form the effective height for car running, where the lane going north and south is defined as a motorized vehicle lane (A), the lane going east and west is defined as a motorized vehicle lane (B). Furthermore, a one-way road at right of the vehicle lane (A) is defined as a positive motorized vehicle lane (A1), a one-way road at left of the vehicle lane (A) is defined as a negative motorized vehicle lane (A2). Similarly, the lane (B) is divided a positive motorized vehicle lane (B1) and a negative motorized vehicle lane (B2), four left change lanes are arranged at the bottom of an approach bridge of the arch bridge and at the corner of a pier, so the positive motorized vehicle lane (A1) is connected with a reverse motorized vehicle lane (B2) by the left change lane.</p> |
