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
Both of them should turn to their right and reduce speed so they pass each other harmlessly.
In Virginia, you must operate at slow-no-wake speed within 50 feet of boat ramps, marinas and moorages.
adverse weather
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.
When you see green and white lights on another boat, you should slow down. This means that you are approaching another boat and you should reduce your speed.
Yes, headlights must be on low beam within 500 feet of an approaching vehicle.
If accelerating to the speed of sound, the subsonic.
20 kms