带概率的路径重定向行为异常技术咨询

Hey there, let's tackle that weird probabilistic route rerouting problem you're facing with your two-intersection SUMO network. First off, kudos on getting the core setup working—cars starting from the left edge and having those turn probabilities at the first junction is a solid foundation, so we just need to iron out the kinks in the rerouting logic.

First, let's start with your provided route file snippet, formatted properly for clarity:

<?xml version="1.0" encoding="UTF-8"?>
<routes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://sumo.dlr.de/xsd/routes_file.xsd">
    <vType accel="1.0" decel="5.0" id="Car" length="5.0" minGap="2.0" ma...
</routes>

Since you only shared a partial snippet, here are the most common pitfalls to check for when probabilistic rerouting misbehaves:

• Verify Probability Configuration Syntax
  SUMO has a few ways to define probabilistic routes, and a small syntax error can throw everything off. For example:

  • If using <flow> elements, make sure you're assigning the correct prob attribute to each flow targeting a different turn direction. Total probabilities across all flows from the same starting edge should add up to 1.0.

    <flow id="left_to_right" type="Car" begin="0" end="3600" number="200" from="left_edge" to="right_edge" prob="0.8"/>
    <flow id="left_to_down" type="Car" begin="0" end="3600" number="200" from="left_edge" to="down_edge" prob="0.2"/>
    

  • If using <probabilisticRoute> (for pre-defined route sets), double-check that the routes and probabilities attributes are correctly aligned, and again that probabilities sum to 1.0.

    <route id="route_right" edges="left_edge junction_in junction_out_right"/>
    <route id="route_down" edges="left_edge junction_in junction_out_down"/>
    <probabilisticRoute id="prob_turn" routes="route_right route_down" probabilities="0.8 0.2"/>
    

• Confirm Edge Connectivity in Your Network
  Even if your route logic looks right, SUMO won't route cars to edges that aren't properly connected at the junction. Open your network file (net.xml) and check that the junction allows turns from the incoming left edge to both the right and down edges. You can use SUMO's Netedit tool to visualize and validate junction connections easily.

• Enable Rerouting in Your Configuration
  If you're using dynamic rerouting (not just pre-defined probabilistic flows), make sure your .sumocfg file includes a <rerouting> section to activate the feature:

  <rerouting>
      <interval begin="0" end="3600"/> <!-- Enables rerouting for the full simulation duration -->
  </rerouting>
  

• Check for Vehicle Type or Route Association Errors
  Ensure that your vehicles/flows are actually using the probabilistic route definition. If you defined a <probabilisticRoute>, make sure your <flow> or <vehicle> references it via the route attribute.

If you can share the full hello.rou.xml file, details about the specific abnormal behavior (e.g., all cars take one turn, probabilities don't match, no rerouting at all), or a snippet of your net.xml around the first junction, we can narrow this down even further.

内容的提问来源于stack exchange，提问作者Michał Lis