What is a consequence of poor roadbed drainage related to signaling?

Poor roadbed drainage can lead to water accumulation around tracks, which can have significant impacts on signaling systems. When water seeps into the signaling infrastructure, it can cause short circuits or other electrical failures, resulting in disruptions to signal functionality. This malfunction can manifest in various ways, such as signals failing to display the correct indications, which could lead to safety concerns and operational inefficiencies.

In contrast, the other options suggest positive outcomes like increased accuracy, improved communication, or better visibility, which are not consistent with the effects of poor drainage. Instead, proper drainage is critical to ensure that signals operate effectively and reliably, reducing the risk of accidents and ensuring smooth train operations.