What sort of warning devices do light rail transits use?

• Regular traffic lights
• Signs and bells
• Gates
• All of the above
  Explanation:

  "Light Rail Transit (LRT) systems are powered by electricity, making them quiet and harder to hear. To ensure safety at crossings, LRTs use a variety of warning devices, including regular traffic signal lights, signs, bells, and gates. These devices help alert drivers and pedestrians to stop and avoid crossing the tracks."