在交通模拟中，十字路口是经常需要遇见的基本单元。在模拟车流通过十字路口时，如果使用前面的方法实现，则需要定义三个车流，并向三个不同的方向运动。但是在sumo中，通过jtrrouter命令实现车流在十字路口转弯的模拟。通过提供三个转向的概率进行车流的模拟。具体的内容可以前往官网查看。
定义一个转向的模拟需要定义三个部分：路网、转向各方向的概率、车流。
在下面的实例中使用前面使用过的十字路口，文件名为cross_rode_2.net.xml
(如果使用前面一模一样的道路文件，有的道路无连接，需要做小改动)
1.编写flow文件
利用前面提到的编写车流的方法编写该文件，代码如下，命名为flows.flows.xml：
<flowdefs> <flow id="f1" from='E1' begin='0' end='100' number='100'/> </flowdefs>代码中定义了从E1道路驶来的车流。
2.编写turn文件
编写转向的车辆，代码如下，命名为：flows_turn.turns.xml：
<turns> <interval begin="0" end="3600"> <edgeRelation from="E1" to="-E2" probability="0.2"/> <edgeRelation from="E1" to="-E3" probability="0.7"/> <edgeRelation from="E1" to="E0" probability="0.1"/> </interval> </turns>代码中定义了从E1驶来的车辆转向各个道路的概率，从上往下分别是左转、直行和右转的概率分别是0.2、0.7、0.1。
3.结合flow和turn生成路由文件
在cmd中，将路径切换到存放文件的位置，我的路径是D:/sumo/project。键入如下命令：
jtrrouter --route-files=flows.flows.xml --turn-ratio-files=flows_turn.turns.xml --net-file=cross_road_2.net.xml --output-file=cross_turn.rou.xml --accept-all-destinations=t最后的--accept-all-destinations=t 是为了接收所有的到达地。如果不加运行会报错。当然，如果在turn文件后加上<sink edges="<EDGE_ID>[ <EDGE_ID>]*"/>表面能出去的边，也可以。
4.结合前面的部分编写.sumocfg文件。
这部分的代码如下：
<configuration> <input> <net-file value="cross_road_2.net.xml"/> <route-files value="cross_trun.rou.xml"/> </input> <time> <begin value="0"/> <end value="100000"/> </time> </configuration>注意路网文件和路由文件的文件名，根据实际情况进行修改。
5.仿真结果
在sumo-gui中打开上述.sumocfg文件就能进行仿真。具体的仿真步骤前面的文章已经介绍过。仿真结果如下：
最后附上路网文件的代码。（因为较前面的有所修改）
<?xml version="1.0" encoding="UTF-8"?> <!-- generated on 2021-12-20 10:54:31 by Eclipse SUMO netedit Version 1.11.0 <configuration xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://sumo.dlr.de/xsd/netconvertConfiguration.xsd"> <input> <sumo-net-file value="D:\sumo\project\cross_road_2.net.xml"/> </input> <output> <output-file value="D:\sumo\project\cross_road_2.net.xml"/> </output> <processing> <geometry.min-radius.fix.railways value="false"/> <geometry.max-grade.fix value="false"/> <offset.disable-normalization value="true"/> <lefthand value="false"/> </processing> <junctions> <no-turnarounds value="true"/> <junctions.corner-detail value="5"/> <junctions.limit-turn-speed value="5.5"/> <rectangular-lane-cut value="false"/> </junctions> <pedestrian> <walkingareas value="false"/> </pedestrian> <report> <aggregate-warnings value="5"/> </report> </configuration> --> <net version="1.9" junctionCornerDetail="5" limitTurnSpeed="5.50" 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