National Highway Traffic Safety Administration in the context of "United States Secretary of Transportation"

A headlamp is a lamp attached to the front of a vehicle to illuminate the road ahead. Headlamps are also often called headlights, but in the most precise usage, headlamp is the term for the device itself and headlight is the term for the beam of light produced and distributed by the device.

Headlamp performance has steadily improved throughout the automobile age, spurred by the great disparity between daytime and nighttime traffic fatalities: the US National Highway Traffic Safety Administration states that nearly half of all traffic-related fatalities occur in the dark, despite only 25% of traffic travelling during darkness.

Aggressive driving is defined by the National Highway Traffic Safety Administration as the behavior of an individual who "Commits a combination of moving traffic offenses so as to endanger other persons or property." In the context of modern vehicle management, understanding and mitigating aggressive driving is a key component of effective Fleet management.