求翻译：图3-12为不同车辆总密度取值时三种状态下（无干扰、有信号控制路段、无信号控制路段）车辆每时步换道次数随密度变化的关系图，是什么意思？

Figure 3-12 for the three states (the value of the total density of the different vehicles without interference, signal control sections, no signal control sections) vehicle each time step the number of lane change diagram with density changes,

Figure 3 - 12 different vehicle density for a value of 3, no interference, and there is a signal control sections, no signal control sections ) vehicles when each step with the changing times, the relationship between the density changes.

Figure 3-12 is when the different vehicles total density value under three conditions (does not have disturbance, has signal control road section, non-signal control road section) the vehicles step trades the while going along number every time along with the density change relational graph,

Figure 3-12 is a different vehicle when the total density value under three (non-interference, signal control sections, no signal control sections) each step when changing the number of vehicles with the diagrams of density changes,

正在翻译，请等待...