control-traffic-lights

Run the freeze command with the green state: `traffic_lights.py freeze on --state green`. This forces every light to green and holds it there until you run `freeze off` or `reset` to resume normal cycling.

Use `set --state red --junction <id>`, where the junction id comes from the map-waypoints skill's junctions listing. You can also target a single light by actor id or the nearest light to a coordinate with `--near X,Y,Z`.

No, this controls the actual traffic.traffic_light actors, not the Traffic Manager. The Traffic Manager (handled by the control-traffic skill) governs how autopilot vehicles behave, including whether they ignore lights.

The `set` command only changes the current state while the light keeps cycling through its phases. To hold a state indefinitely, use `freeze on`, or change the cycle itself with the `timing` command.

You need the carla Python module importable in the active interpreter and a reachable, already-running CARLA server (default 127.0.0.1:2000). UE4_ROOT and a source checkout are not required; run check_env.sh to verify.