What does a level crossing sign with a blue border indicate?

A level crossing sign featuring a blue border signifies that predictor circuitry is installed at that specific crossing. This technology works to enhance safety by detecting the approach of trains and providing advanced warnings to road users. The blue-bordered signs are part of a traffic management system, helping to ensure that motorists are aware of upcoming train activity, thereby significantly reducing the risk of accidents.

Predictor circuitry typically operates by signaling when a train is approaching, which is crucial for both vehicular safety and efficient rail operations. Enhanced rail safety measures, such as these, are important components of the overall train management system.