Globally, countries use a combination of advanced sensing, smart infrastructure, and vehicle technologies to reduce accidents caused by fog:

1. Fog Detection Systems: LIDAR, visibility sensors, and Road Weather Information Systems (RWIS) to measure fog density in real time.

2. Smart Traffic Management: Variable Message Signs (VMS), adaptive speed limits, and intelligent traffic signals to warn drivers and control flow.

3. Vehicle Safety Technologies: Advanced Driver Assistance Systems (ADAS), automatic emergency braking, lane-keeping assist, and fog lamps integrated with sensors.

4. Infrared & Thermal Imaging: Used in vehicles and surveillance to detect obstacles in low visibility.

5. Smart Road Infrastructure: LED-embedded road markings and reflective studs for better lane guidance.

6. Aviation & Rail Technologies: Instrument Landing Systems (ILS CAT II/III), advanced radar, and GPS-based navigation.

7. Early Warning & Alerts: AI-based weather forecasting, mobile alerts, and in-car navigation warnings.

8. These technologies collectively improve visibility, driver awareness, and emergency response, significantly reducing fog-related accidents.