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A high fidelity traffic simulation model based on cellular automata and car-following concepts

机译:基于元胞自动机和跟车概念的高保真交通仿真模型

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A high fidelity cell based traffic simulation model (CELLSIM) has been developed for simulation of high volume of traffic at the regional level. Straightforward algorithms and efficient use of computational resources make the model suitable for real time traffic simulation. The model formulation uses concepts of cellular automata (CA) and car-following (CF) models, but is more detailed than CA models and has realistic acceleration and deceleration models for vehicles. A simple dual-regime constant acceleration model has been used that requires minimal calculation compared to detailed acceleration models used in CF models. CELLSIM is simpler than most CF models; a simplified car-following logic has been developed using preferred time headway. Like CA models, integer values are used to make the model run faster. Space is discretized in small intervals and a new concept of percent space occupancy (SOC) is used to measure traffic congestion. CELLSIM performs well in congested and non-congested traffic conditions. It has been validated comprehensively at the macroscopic and microscopic levels using two sets of field data. Comparison of field data and CELLSIM for trajectories, average speed, density and volume show very close agreement. Statistical comparison of macroscopic parameters with other CF models indicates that CELLSIM performs as good as detailed CF models. Stability analyses conducted using mild and severe disturbances indicate that CELLSIM performs well under both conditions.
机译:已经开发了一种基于高保真小区的交通模拟模型(CELLSIM),用于在区域级别模拟大量交通。直截了当的算法和有效利用计算资源使该模型适合实时交通仿真。该模型公式使用了元胞自动机(CA)和跟车(CF)模型的概念,但是比CA模型更为详细,并且具有用于车辆的逼真的加速和减速模型。与CF模型中使用的详细加速度模型相比,已使用了一种简单的双区域恒定加速度模型,该模型需要最少的计算。 CELLSIM比大多数CF模型更简单。已使用首选的时间进度开发了简化的跟车逻辑。与CA模型一样,使用整数值可以使模型运行更快。以小间隔离散空间,并且使用空间占用百分比(SOC)的新概念来衡量交通拥堵。 CELLSIM在拥挤和不拥挤的交通状况下表现良好。已使用两组现场数据在宏观和微观层面进行了全面验证。现场数据和CELLSIM的轨迹,平均速度,密度和体积的比较显示出非常接近的一致性。宏观参数与其他CF模型的统计比较表明,CELLSIM的性能与详细的CF模型一样好。使用轻度和严重干扰进行的稳定性分析表明,CELLSIM在两种情况下均表现良好。

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