Time-space plots. Black points denote cars, green and red points represent buses among which the red one refers to the left-turning bus. Blue points denote the queuing vehicles incurred by waiting buses. L = 100. Panels (a1) and (b1) refer to the left lane, (a2) and (b2) the middle lane, (a3) and (b3) the right lane, and (a4) and (b4) the time-space plot of the bus stop.