Space travel is not considered a primary mode of transportation due to its limited accessibility and high cost.

Distracted driving, such as using mobile phones or engaging in other activities while driving, is the primary cause of road accidents globally.

Seatbelts are the most crucial safety device in vehicles, significantly reducing the risk of injury or death in a collision.

In many countries, the legal BAC limit for drivers is 0.08%, above which it is considered driving under the influence (DUI) and is illegal.

Warning signs are not a common type of road sign; they are typically used to alert drivers to potential hazards or changes in road conditions.

Human error, including pilot error and air traffic control errors, is the leading cause of air accidents.

Flaps are aerodynamic surfaces that increase the lift and drag of an aircraft, helping to prevent it from stalling at low speeds.

The primary purpose of a life jacket is to keep the wearer afloat in water, preventing them from sinking and drowning.

Bicycle is not a watercraft; it is a land vehicle.

Derailments, where a train leaves the tracks, are the most common and severe safety concern in rail transportation.

Positive Train Control (PTC) is a safety system that automatically controls train movements to prevent collisions, derailments, and overspeeding.

In urban areas, passenger trains typically have a maximum speed limit of 50 mph due to safety concerns and the need to navigate densely populated areas.

Bicycle helmet laws are not typically considered a transportation safety regulation; they are more specific to cycling safety.

The primary goal of transportation safety is to reduce the number of accidents and incidents, thereby protecting lives and property.

The International Civil Aviation Organization (ICAO) is the specialized agency of the United Nations responsible for setting global standards for civil aviation safety.