Which factor is usually included in the determination of collision circumstances?

The determination of collision circumstances typically involves analyzing environmental conditions at the time of the collision. This includes factors such as weather conditions (rain, fog, snow), road surface conditions (wet, icy, or dry), visibility (darkness, road lighting), and other external factors that could affect the behavior of drivers and the performance of vehicles. These elements are critical in understanding how they may have contributed to the accident, such as whether low visibility conditions may have resulted in a driver's inability to see a traffic signal or another vehicle.

Other options, while potentially relevant to broader discussions about traffic safety, do not directly pertain to the specific circumstances that led to a collision. For example, the duration of the traffic signal might provide context but does not address how environmental conditions played a role. Driver age statistics are more about demographics and less about specific incidents, and the prevalent vehicle brand may indicate trends in safety but does not directly influence the immediate circumstances of a collision.