Perception-reaction times are used in the reconstruction traffic accidents. Find out where the current values come from and how they are applied to various situations. There are ways to tell if the headlights, taillights or brake lights on a car were on or off following a collision. This article details some of the things to look for when conducting a lamp examination. A large percentage of accidents happen just at sunset and sunrise.
Many states require headlights to be used in conjunction with civil twilight.
The possibility of glare from the sun can also be analyzed. This article provides details and resources on determining the position of the sun and moon for any place on Earth at any time and where to obtain historical weather data. This link will take you to the introduction page for low speed rear end collisions. An article on correlating vehicle damage profiles to occupant injuries, a New York Supreme Court decision on the use of experts in such accidents and a special offer for a trial presentation by an expert in traffic accident reconstruction is posted here. This is a very basic primer on how to determine vehicle speeds from skidmarks.