How should you interpret a caution board with a '10' below it and '30' above it when multiple TSRs are close together?

The interpretation of the caution board displaying a '10' below it and '30' above it indicates that the top number specifies the higher speed limit. In this scenario, the '30' represents the maximum permissible speed that a train can travel when conditions allow, while the '10' indicates a lower speed limit that may apply at specific locations or under certain conditions.

When multiple Temporary Speed Restrictions (TSRs) are in close proximity, it's crucial for operators to recognize the higher allowed speed to ensure safe operations. This speed display format helps in distinguishing which speed limit is to be adhered to, thus supporting safe train movements.

By understanding that the caution board's top number signifies the higher speed limit, operators can make informed decisions about train speed in relation to the risks and operational context, prioritizing safety while maintaining efficiency.