Which locations are indicated as hazard areas for navigation?

The identification of hazard areas for navigation is critical for ensuring safety at sea and on inland waters. Bridges are considered significant hazard areas because they can obstruct navigation and pose risks to vessels, particularly if their clearance is insufficient for certain types of boats. Additionally, bridges can create currents and turbulence, complicating the navigation process.

Fish traps also represent a navigation hazard. These structures can be difficult for mariners to see, especially in low visibility conditions, and may become entangled with vessels, posing a risk to both the safety of the crew and the integrity of the vessel. Since fishing traps may not always be marked clearly, they can easily be a source of danger for navigators who are unaware of their presence.

While rivers can undoubtedly have hazard areas, the framing of "only rivers" does not encompass the broader scope of potential hazards that exist, which includes both bridges and specific fishing structures. Similarly, while “only bridges” might identify one specific type of hazard, it does not acknowledge the significant risks posed by fish traps.

In summary, the correct response accurately reflects that both bridges and fish traps create navigation hazards, emphasizing the need for mariners to be aware of these specific areas to ensure safe passage.