Final answer:
It is true that one should slow down at railroad crossings to ensure safety and be prepared to stop if required, especially if there are signals such as flashing lights, lowering gates, or stop signs.
Step-by-step explanation:
When approaching any railroad crossing, there is a general rule of safety that should be followed. It is indeed often true that you should slow down when coming to a railroad crossing, to ensure you can stop safely if a train is approaching. However, the specifics can vary depending on the crossing's signals and whether a train is visible or not. For example, if there are flashing lights, a lowering gate, or a stop sign at the crossing, it is mandatory to completely stop, not just slow down. Regardless, exercising caution and being prepared to stop if necessary is essential for safety.