In heavy rain, traffic ahead of you is moving slowly towards a level crossing. What should you do?

Explanation

The Highway Code Rule 291 says you must never drive onto a level crossing until the road is clear on the other side, and you must never stop or park on or near a crossing. In poor weather such as heavy rain, it may be harder to see and traffic may slow down, so it is especially important to wait before the crossing until you can safely drive fully across without stopping.