苜蓿叶立交集散车道内车辆运行速度特征分析

为了确定高速公路苜蓿叶立交集散车道车辆运行速度特征和速度值,确保车辆在集散车道上运行协调可控,使车辆在行驶时能够安全运行。采用雷达测速仪对集散车道各出入车辆运行速度进行实地采集,选取互通立交集散车道特征点处自由流状态下车辆速度作为分析样本,建立主线车辆通过集散车道驶出高速和相交高速车辆通过集散车道驶入主线的速度运行曲线。结果表明:车辆通过集散车道进入出口匝道1,整个车辆运行过程中处于减速状态,从分流点到鼻端减速较慢;而从鼻端到第一个出口车辆减速较快。车辆通过集散车道进入出口匝道2,车辆先减速后匀速,到达交织区时再次减速,最后驶入匝道。车辆从入口匝道1进入集散车道,车辆以较为稳定的加速驶入主线。车辆从入口匝道2进入集散车道,先以较大的加速行驶,后缓慢加速驶入主线。可见,车辆通过集散车道出入高速公路运行速度呈现出规律性。通过对车辆运行速度分析,对集散车道车辆的交通安全防控和规范的完善有着重要价值。

Analysis on Vehicle Running Velocity of Alfalfa Leaf Interchange Distributed Lane

In order to measure characteristics and values of vehicle running velocity in the alfalfa leaf interchange distributed lane and ensure that vehicles ran coordinately and controllable, vehicles could be ran safely. The radar speed meter was used to collect the running velocity in and out of velocities for distributed lanes on the spot. Selecting the velocity being as analytical sample in the characteristic point of interchange distributed lane when the vehicle was in free flow state, the curves of running velocities could be attained while the main lane vehicle ran out of highway and Intersecting high-speed vehicle ran into the main lane through distributed lanes. The results showed when vehicles were drove from the lane to off-ramp 1, the whole running process of vehicles was in decelerating state. Meanwhile, the velocity decelerated slowly from the diversion point to the tip of nose gear and the vehicle decelerated faster from the nose to the first exit yet. When vehicles were from the lane to off-ramp 2, the vehicle was decelerated firstly whereas uniform speed, decelerated again when interleaving lane and entrancing ramp at the end. When vehicles were form on-ramp 1 to the lane, the vehicle was accelerated into the relatively stable line. When vehicle from the on-ramp to 2 lane, with larger acceleration, slow speeds in the line. It can be seen that the running velocity is a regular way when vehicle passing through the distributing lane. By analyzing the running velocity of vehicles, it is of great value to the traffic safety control and standardization improvement of the distributing lane.