SUMO仿真固定车辆数随机车流生成及特定路网需求实现

Great question—let’s break down exactly how to generate your desired traffic setup in SUMO, covering fixed vehicle counts, random departure times, fixed start/end edges, and vehicle type customization.

Core Approach: Customize SUMO’s randomTrips.py Tool #

SUMO’s built-in randomTrips.py script is perfect for this scenario. We’ll tweak its parameters to enforce your requirements instead of using generic random trips.

Command Line for Your Exact Scenario #

Run this command (adjust paths and values to match your simulation):

python $SUMO_HOME/tools/randomTrips.py -n your_network.net.xml -s road1 -e road10 -N 1000 -r custom_routes.rou.xml -b 0 -E 3600 --random-departure

Let’s break down each key parameter:

• -n your_network.net.xml: Path to your SUMO network file (contains roads 1-10)
• -s road1: Forces all trips to start at edge road1
• -e road10: Forces all trips to end at edge road10
• -N 1000: Generates exactly 1000 vehicles (trips)
• -r custom_routes.rou.xml: Outputs the generated routes to this file
• -b 0: Sets the earliest possible departure time to simulation start (0s)
• -E 3600: Sets the latest departure time to 3600s (1 hour—replace with your actual simulation duration)
• --random-departure: Randomizes departure times across the simulation window (instead of evenly spacing them)

Adding Vehicle Type Customization #

You can easily add vehicle-specific settings (like acceleration, max speed, or size) using two methods:

Option 1: Use Predefined Vehicle Classes #

SUMO has built-in classes like passenger, truck, or bus. Assign them directly via the command line:

# Generate 800 passenger cars and 200 trucks
python $SUMO_HOME/tools/randomTrips.py -n your_network.net.xml -s road1 -e road10 -N 800 -r passenger_routes.rou.xml -b 0 -E 3600 --random-departure --vehicle-class passenger
python $SUMO_HOME/tools/randomTrips.py -n your_network.net.xml -s road1 -e road10 -N 200 -r truck_routes.rou.xml -b 0 -E 3600 --random-departure --vehicle-class truck

Then merge the two route files into one (you can do this manually by copying all <trip> elements into a single routes.rou.xml file).

Option 2: Define Custom Vehicle Types #

For full control over vehicle properties, create custom types in your route file (or a separate types.xml):

<routes>
    <!-- Custom vehicle types -->
    <vType id="sport_car" accel="3.0" decel="6.0" maxSpeed="140" length="4.2" color="1,0,0"/>
    <vType id="heavy_truck" accel="1.2" decel="4.5" maxSpeed="85" length="14" color="0,0,1"/>

    <!-- Paste trips generated by randomTrips.py here -->
</routes>

Then assign these types when generating trips:

python $SUMO_HOME/tools/randomTrips.py -n your_network.net.xml -s road1 -e road10 -N 500 -r custom_routes.rou.xml -b 0 -E 3600 --random-departure --vtype sport_car

Enforce Exact Route Sequence (Optional) #

If you want every vehicle to take the exact path road1 → road2 → ... → road10 (instead of letting SUMO’s router choose), define a fixed route first:

<routes>
    <route id="highway_route" edges="road1 road2 road3 road4 road5 road6 road7 road8 road9 road10"/>
</routes>

Then use the --route-id parameter to assign this route to all trips:

python $SUMO_HOME/tools/randomTrips.py -n your_network.net.xml -N 1000 -r custom_routes.rou.xml -b 0 -E 3600 --random-departure --route-id highway_route

Verify Your Setup #

After generating the route file, double-check:

• Count the <trip> elements to confirm there are exactly 1000 vehicles
• Check the depart attribute of trips to ensure random times between 0 and your simulation end time
• Ensure all trips have from="road1" and to="road10" (or use the fixed route as above)

内容的提问来源于stack exchange，提问作者J.G