Lua trigger to measure driver’s reaction time

General
1

Hello, in beamng.tech, how to set a lua trigger that makes a car comes in front of me, so that I can measure the driver’s reaction time?
I tried asking AI GPT’s but I didn’t receive a functional answer/script.
Extremely urgent.
Thanks

2

Hi EngQ8,

Thanks for your question! To clarify and ensure we provide the most accurate support, are you asking how to programmatically spawn or move an AI-controlled vehicle into the user’s path in BeamNG.tech using Lua scripting during a driving simulation? Additionally, are you looking to record the user’s reaction time from the moment the event occurs to when the driver takes action (e.g., braking or steering)?

3

Hello, thank you for your reply.
Yes that is exactly what I want; I want a vehicle to come in front of the driver’s path when the driver passes a certain trigger. And I need to measure how much the driver brakes and steers to avoid collision, and to measure the reaction time.

Thank you

4

Dear EngQ8,

Here are the three main approaches using BeamNGpy for creating a car that appears in front of you for reaction time testing:

Option 1: AI Scripts (Recommended)

script = [
    {"x": -719.0, "y": 106.0, "z": 118.0, "t": 0.0},
    {"x": -758.0, "y": 67.0, "z": 118.0, "t": 5.0},
    {"x": -825.0, "y": 0.0, "z": 117.0, "t": 12.0},
]
cut_in_vehicle.ai.set_script(script)

Option 2: Direct Control

cut_in_vehicle.teleport(pos=(-100, 0, 142.8))
cut_in_vehicle.control(throttle=1, steering=0, brake=0)

Option 3: Waypoint Navigation

cut_in_vehicle.ai.set_waypoint("Bridge26_2")

Option 4: Flowgraph Editor

Use BeamNG Flowgraph for complex orchestration.

For reaction time testing, I recommend Option 1 - it provides precise timing control and reproducible results.

Best regards,
Abdul

5

Hello Asaeed

Thank you very much for your reply. I really appreciate it.

I will try your solutions and let you know.

Much obliged,

EngQ8

1 Like
6

Hi @EngQ8,
I just thought of something that might be useful for positioning the other vehicle that will face the player’s vehicle. You can use <vehicle>.teleport((x, y, z), reset=False) to place it directly in front of the driving vehicle.

Best regards,
Abdul