How does the blue border level crossing sign affect train crew?

The blue border level crossing sign serves as an important indication for train crews regarding speed management at level crossings. When crews see this sign, it communicates that the train must not increase its speed after passing the circuitry that activates the crossing signals or gates. This is crucial for maintaining safety in the area surrounding the crossing, ensuring that the train avoids potential hazards such as vehicles or pedestrians who may be present.

The restriction on increasing speed helps to facilitate safer operations, allowing for better response times should an incident occur at the crossing. Moreover, it ensures compliance with safety regulations that are put in place to protect both train operations and road users. As such, this sign is designed to promote a cautious approach to speed in proximity to level crossings.