Pedestrian safety, especially for schoolchildren, constitutes a world concern. For the condition of peak hour, we observed that there are many urgent problems of conflicting between traffic flow on the road and the pedestrian crossing but it varied through two underlying factors, road type which refer to traffic volume and pedestrian (students) volume crossing the road. Traffic conflict would be the best feature of measuring the potential of the traffic accident. This study presented situations and traffic safety devices at school zones especially in front of operating school gates. The objectives of this paper are: (1) to compare the student’s conflicting accident to vehicle with the present of traffic safety devices (TSDs) in front of 35 primary school gates in Phnom Penh city and (2) to recommend a minimum standard of TSDs to prevent increasing accident for school children. For the TSDs refer to: Zebra Road crossing, School crossing warning, school zone warning, Speed limit, and slow down sign. Questionnaire was designed to interview School director or teachers to have the data of student such as the total number of students, number of students in each session, percentage of student who need to cross the road, transport mode and some recording information about accident on students in front of the 35 selected primary school gate in Phnom Penh. Some additional data we got from interviewing the traveller and vendors along the school zone about the situation of traffic accidents. It can be used to compare to the data we got from the school director or teachers. The existing geometry was observed and recorded such as (TSDs, Road Type, Lane width, Walkability, and overall behavior) for 35 target schools also. The locations of TSDs are measured from the school gate and the traffic volume was recorded in 45min at the peak hours. After getting numerical data from a survey of each sample school so that we can compare to the score obtained from evaluation on TSDs of each school, the effectiveness of TSDs on accidents will be shown. Regression of two-sample mean test models was used to analyse and show results through input variables. The effective factors of traffic accidents were identified such as Traffic volumes, number of students and speed etc. The minimum standard of TSDs in front of school gates was designed and proposed base on effective factors to conduct and enforce for protecting schoolchildren from high-risk situations of accidents. In conclusion, TSDs is very important for facilitating schoolchildren to cross the road and prevent the traffic accident, especially saving life of schoolchildren from accidents.