写一段LGSVL仿真器简单的主车速度值为5m/s时，在主车后方15m的小车在三秒内变道并且在两秒内超过主车的Python代码

Sure! Here's an example Python code to simulate a scenario where a small vehicle, located 15 meters behind the main vehicle with an initial speed of 5 m/s, changes lanes and overtakes the main vehicle within three seconds:

import lgsvl

# Connect to the simulator
simulator = lgsvl.Simulator("127.0.0.1", 8181)

# Load the map
simulator.load("YourMapName")

# Get the main vehicle
main_vehicle = simulator.get_agent("Main Vehicle")

# Set the initial speed of the main vehicle
main_vehicle.control.throttle = 0.5  # Assuming initial speed of 5 m/s

# Set the small vehicle behind the main vehicle
small_vehicle = simulator.add_agent("Sedan", lgsvl.AgentType.NPC, lgsvl.Vector(main_vehicle.state.position.x, main_vehicle.state.position.y, main_vehicle.state.position.z - 15), main_vehicle.state.rotation)

# Set the target lane for the small vehicle
target_lane = small_vehicle.lane_change_available(main_vehicle.state.lane_id)

if target_lane is not None:
    small_vehicle.follow_closest_lane(True)
    small_vehicle.change_lane(target_lane)

# Run the simulation for three seconds
simulator.run(3)

# Set the target speed for the small vehicle to overtake the main vehicle
small_vehicle.control.throttle = 1.0  # Maximum throttle

# Run the simulation for two seconds
simulator.run(2)

# Stop both vehicles
main_vehicle.control.throttle = 0
small_vehicle.control.throttle = 0

Again, make sure to replace "YourMapName" with the actual name of the map you are using in the simulator. The code assumes that the main vehicle has a constant throttle value of 0.5 (which corresponds to a speed of 5 m/s) initially. The small vehicle changes lanes if a lane change is available and then accelerates to overtake the main vehicle.