Any potential hazard
When approaching the Zebra Crossing you have to reduce speed, put your hazard lights, signal your intensions to stop. Then take off when the pedestrians have crossed
The rumble device is designed to - encourage you to reduce your speed - alert you of a hazard approaching
You must slow your personal watercraft (PWC) to slow no wake speed when you are approaching a dock, marina, or any area with other boats or swimmers present. Additionally, you should reduce your speed in narrow channels, near the shore, or in areas marked with buoys indicating no wake zones. This helps ensure the safety of others and minimizes the impact of your wake on the environment.
Both of them should turn to their right and reduce speed so they pass each other harmlessly.
When approaching a mooring buoy, you should reduce your speed to maintain control and avoid excessive wake. Assess the wind and current conditions to determine the best approach angle. Use fenders to protect your vessel and prepare lines for securing to the buoy. Finally, ensure proper communication with your crew for a smooth mooring process.
In Virginia, you must operate at slow-no-wake speed within 50 feet of boat ramps, marinas and moorages.
Vessel operators are required to reduce speed in various situations, including near navigation hazards, in congested waterways, during adverse weather conditions, or when operating in marine protected areas to minimize environmental impact. Additionally, speed reductions are mandated in certain zones, such as near schools of fish or when approaching other vessels to ensure safety. Operators must also comply with local regulations that specify speed limits in designated areas.
adverse weather
In Nebraska, when approaching a stationary law enforcement vessel displaying its blue lights, you should reduce your speed and, if safe to do so, change lanes to move away from the vehicle. If changing lanes is not possible, you must maintain a safe speed and be prepared to stop if necessary. Always remain alert and comply with any instructions given by law enforcement.
In Virginia, personal watercraft (PWC) operators must slow to a no-wake speed when approaching a sailboat within 50 feet. This regulation is designed to ensure the safety of both the sailboat and the PWC, minimizing the risk of collisions and disturbances. Adhering to this speed limit helps protect the integrity of the sailboat and the safety of its passengers.
This is not related to physics but to the driver's attention when approaching a curve. If the speed is kept the same, it's more difficult to control the vehicle specially if the driver is stressed, drunk, tired or sleepy. The probability of an accident would increase on this situation.
We call them ultra sonic planes. There is a sonic boom it is traveling when this speed.