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下穿隧道由于照明条件较差,隧道内视野呈管状分布,周边环境单调,极易引起驾驶员的视觉及生理疲劳,较地面道路更易发生事故;同时,由于空间封闭性使得发生事故时难以进行疏散和救援。因此,在下穿隧道内,一般都禁止车辆超车和变道。当城市复杂下穿隧道因规划和交通组织需要车辆在隧道内变道进行分合流时,应采取必要的工程措施满足隧道内交通组织的需求。
Tunnel under the tunnel due to poor lighting conditions, the tunnel was tubular tubular field of vision, the surrounding environment is monotonous, easily lead to the driver’s visual and physical fatigue, more prone to accidents than the ground roads; the same time, due to the spatial confinement makes it difficult to carry out accidents Evacuation and rescue. Therefore, in the next tunnel, generally forbid vehicles passing and lane change. When the urban complex tunnel under the tunnel due to planning and transportation organizations need to change vehicles in the tunnel diversion, should take the necessary engineering measures to meet the needs of traffic organizations within the tunnel.