At the entrance to an industrial estate, there is a St. Andrew's Cross with the supplementary sign "Industrial estate, rail vehicles have precedence". What must you remember?

When you see a St. Andrew's Cross with the supplementary sign indicating that rail vehicles have precedence, it is crucial to be aware of certain traffic rules.

1. Approaching level crossings at moderate speed is important because it allows you to react quickly if a train is approaching. This aligns with the principle of safety and caution at these potentially dangerous crossings.

2. Rail vehicles indeed have precedence at all level crossings marked with this sign. This means that, regardless of other conditions, trains or rail vehicles will always have right of way when crossing the road at these designated locations.

Moreover, the option stating that motor vehicles have precedence at level crossings without a St. Andrew's Cross is not applicable in this scenario. It only applies in situations where there are no specific signs indicating that rail vehicles have precedence.

Understanding these points ensures that you prioritize safety around rail crossings to prevent accidents.