set-world-settings

Run the world_settings.py script with the sync command, for example sync --fps 20, which sets synchronous_mode to True and fixed_delta_seconds to 0.05. The Traffic Manager is set synchronous at the same time, and the server then advances only when your client calls world.tick().

Use sync --fps 20 or sync --delta 0.05 to set a fixed step; fps is derived as 1 divided by fixed_delta_seconds. Keep the step at or below 0.1 seconds for stable physics, and the script raises max_substeps automatically if the substep budget is exceeded.

In synchronous mode the server advances only when a client calls world.tick(), so a frozen appearance means nothing is ticking it. Tick from your client, or run the async command to hand the clock back to the server.

Jittery traffic means the world is synchronous but the Traffic Manager is asynchronous, or vice versa. The sync and async commands set both together; manually you would call tm.set_synchronous_mode(True) on the same TM port.

No, it only needs the carla Python module importable by the active interpreter and a reachable, already-running CARLA server. It does not need UE4_ROOT or a source checkout, and it was tested against CARLA 0.9.16.

load_world and reload_world reset settings unless reset_settings is False, so pair this skill with the load-map skill's --keep option. Re-assert Traffic Manager sync after the load because a load detaches the old world.