What is one of the indicators of a potential road hazard?

The vehicle’s dashboard warning lights serve as crucial indicators of potential road hazards, alerting the driver to issues that may require immediate attention. For instance, warning lights may indicate engine problems, low oil pressure, or brake system failures, any of which could significantly impact vehicle performance and safety. This information is vital for a driver to stay informed about the vehicle's condition and to take appropriate action to avoid potential hazards on the road.

In contrast, other options may not directly relate to the vehicle's immediate hazards. For instance, a sudden increase in vehicle speed could suggest aggressive driving or road conditions but does not inherently indicate an unavoidable hazard. Unusual traffic sign placements may signal confusion or driver error but do not provide a direct indication of a hazard that could affect vehicle operation. Similarly, an inconsistent gradient of the road surface could affect driving but is not as immediate or clear-cut as the signals given by dashboard warning lights. Therefore, the correct response highlights the importance of staying aware of the vehicle's health through its warning system, which directly correlates with safe driving practices.