It is the occurrence in a sequence of events which usually produces unintended injury, death, or property damage.

An accident involving travel transportation on a traffic way.

Events resulting in unintended injury or property damage attributable directly or indirectly to the action of a motor vehicle or its loads.

Every device which is self-propelled and every vehicle which is propelled by electric power obtained from overhead trolley wires, but not operated upon rails.

An event on the road which characterizes the manner of occurrence of a motor vehicle traffic accident.

The scattered broken parts of vehicles, rubbish, dust and other materials left at the scene of the accident caused by collision.

These are marks left on the roadway by tires which are not free to rotate, usually because brakes are applied strong and the wheels locked.

Any person using a traffic way for travel, parking or other purposes as a pedestrian or driver, including any vehicle, or animal which he is using.

it is generated when a critical space motion relationship between a traffic unit and another object develops due to the movement or either or both.

The speed adjusted to the potential or possible hazards or the road and traffic situation ahead.

It is the adjusting of speed, position on the road, and direction of motion, giving signals of intent to turn or slow down, or any other action in situations involving potential hazards.

Any action taken by the traffic unit to avoid hazardous situations like steering, braking, or accelerating to avoid collision or other accident.

The striking of one body against another or a collision of a motor vehicle with another motor vehicle.

Damage to a vehicle resulting from direct pressure of some foreign object in a collision or roll over.

Any circumstances contributing to a result without which the result could not have occurred or it is an element necessary to produce the result, but not by itself sufficient.

A misnomer loosely applied to the most obvious or easily explained factor in the cause of an accident or the most easily modified condition factor.

The combination of simultaneous and sequential factors without any one of which result could not have occurred.

Any inherent characteristics of a road, a vehicle, or a person that affects the probability of a traffic accident.

A circumstance that alters an attribute permanently or temporarily.

it refers to procedures, devices, and communication systems that help vehicles and vessels safely share the same roads, rails, waterways, or air space.

The primary emphasis of traffic control is on the safe and efficient flow of cars, buses, vans, and lorries over urban streets and highways.

This are the most extensively used form of traffic control in the United States.

It separate opposing streams of traffic and direct vehicles into proper positions on the roadway.

This are installed to permit safe movement of vehicles and pedestrians at busy intersections.

In one of the oldest methods of traffic control, one form of transportation is given priority by restricting or banning other forms of transportation.

As an alternative to banning traffic, traffic control planners use devices to discourage heavy use of a route.

It is seeing, feeling, or hearing and understanding the usual or unexpected movement or condition that could be taken as sign of the accident about to happen.

It is the first action taken by a traffic unit to escape from a collision course or otherwise avoid a hazard.

The first accidental touching of an object collision courses or otherwise avoids hazard.

It is greatest collapse or overlap in a collision. The force between the traffic unit and the object collided with are greatest at maximum engagement.

It is the separation of a traffic unit in motion from an object with which it has collided. The force between the object ceases at this time.

This is when the traffic unit/s involved come to rest. It is usually stabilizing the accident situation.

It is receiving bodily harm. This event does not necessary occur after the accident but within in any of the chain of events. It may also happen right after the evasive action taken by the drivers involved or during the initial contact.

may be walking, running or standing on a roadway.

may be head on, head and rear, sides opposite direction, sides the same direction, head and side collision, etc.

the form of collision may be similar to a moving vehicle like head on collision, however, one is parked anywhere on a roadway.

this type of collision usually occurs along railroad crossings.

in this form of collision, it is either the motor vehicle or the bicyclist who initiated the collision.

traffic islands, pedestrian barriers, and electric post.

This stage involves basic data collection to identify and classic a motor vehicle, traffic ad persons, property and planned movements involved.

This level involves all action taken by the investigator at the scene of the crime or accident.

This involves delayed traffic accident data collection and organization for study and interpretation.

This involves efforts to determine from whatever information is available, how the accident happened.

This last level usually involves final analysis on the causes of accident which are bases for the prevention of similar accident.