What kind of messages do warning signs convey?

Warning signs are specifically designed to alert drivers about potential hazards or dangerous conditions on the road. These signs are crucial for maintaining safety by informing drivers of circumstances that could lead to accidents or unsafe situations. For example, a warning sign may indicate a sharp turn, a pedestrian crossing, or road work ahead, all of which require drivers to exercise caution and adjust their driving behavior accordingly.

Choosing warning signs provides drivers with vital information that helps them anticipate dangers, thus allowing for safer navigation on the roads. The other options presented do not align with the primary purpose of warning signs, as they focus on directions, information, vehicle maintenance, or public transport, which are communicated through different types of road signs and not specifically warning signs.