Victims due to traffic accidents are more than 5000 of death and 22000 injures with different hurts, annually. Economical loses are 2 % from national total income according data of Egyptian society for protection from traffic accidents. Traffic accidents consider the second reason for death in Egypt. 80 % of victims are 15: 45 years old (age of offering). Objective of study is to investigate factors affect on traffic accidents, this study concentrate on (human, place, and time). Study includes (1) Introduction about how we carried out applications. (2) Factors of human affect on traffic accidents: behaviors of drivers and pedestrians. (3) Investigate reasons of traffic accidents due to place. (4) Investigate time of traffic accidents about hours /day / week /month / season / year. (5) Arrive to conclusions and remarks according analysis of study. (6) Put recommendations about how to decrease consequences of traffic accidents in Egypt.