"🚦🚗🚕🚙🚚🚛🚓🚑🚒🚐🚔🚕🚖🚗🚘🚙🚚🚛🚜🚲🛵🏍️🚨🚥🛑🚧🚏🚌🚍🚊🚉🚈🚂🚆🚄🚅🚇🚝🚋🚃🚎🚈" - A collection of vehicles, signals, and infrastructure that represent the traffic system.