Fog may lead to some travel disruption. What to expect: Slower journey times with delays to bus and train services possible There is a chance of delays or cancellations to flights Further details: Areas of fog will develop on Tuesday night, initially across the west of the warning area before spreading east through the night. Patches of dense fog are expected which may lead to difficult travel conditions. Fog will clear from the west of the area before dawn, but will be slower to clear from the East Midlands and southeast. What Should I Do? Give yourself the best chance of avoiding delays by checking road conditions if driving, leaving extra journey time, or amending plans if necessary. Make sure you know how to switch on your fog lights, and check they are working before setting off on your journey. Bus and train services, as well as flights may also be affected; check for updates from your travel company and follow their advice. Be prepared for weather warnings to change: when a weather warning is issued, the Met Office recommends staying up to date with the weather forecast in your area.