traffic_distribution.py 文件源码

def __init__(self, scenario_flag = "Freeway_Free"):
        """
        Totally five scenarios are supported here:
        Freeway_Night, Freeway_Free, Freeway_Rush;
        Urban_Peak, Urban_Nonpeak.
        The PDFs of the vehicle speed and the inter-vehicle space are adapted 
         from existing references.
        """
        if scenario_flag == "Freeway_Night":
            self.headway_random = expon(0.0, 1.0/256.41)
            meanSpeed = 30.93 #m/s
            stdSpeed = 1.2 #m/s
        elif scenario_flag == "Freeway_Free":
            self.headway_random = lognorm(0.75, 0.0, np.exp(3.4))
            meanSpeed = 29.15 #m/s
            stdSpeed = 1.5 #m/s
        elif scenario_flag == "Freeway_Rush":
            self.headway_random = lognorm(0.5, 0.0, np.exp(2.5))
            meanSpeed = 10.73 #m/s
            stdSpeed = 2.0 #m/s
        elif scenario_flag == "Urban_Peak":
            scale = 1.096
            c = 0.314
            loc = 0.0
            self.headway_random = fisk(c, loc, scale)
            meanSpeed = 6.083 #m/s
            stdSpeed = 1.2 #m/s
        elif scenario_flag == "Urban_Nonpeak":
            self.headway_random = lognorm(0.618, 0.0, np.exp(0.685)) 
            meanSpeed = 12.86 #m/s
            stdSpeed = 1.5 #m/s
        else:
            raise

        self.speed_random = norm(meanSpeed, stdSpeed)