A Study on Countermeasures of Hazardous Intersection
To promote transport safety and decrease road hazards, the government has invested lots of manpower and expense on accident-prone locations. However there is no comprehensive working manual, the main causes of accidents for analyzing, and evaluating the effectiveness. Therefore, of various measures used for the safety improvement, 61 intersections from the 14TH and 15TH "Project of Accident-Prone Locations Improvement in Taiwan Area" were selected for the research. To identify the main causes of the accidents occurred in the selected locations, not only the associated literatures were reviewed, but also an interview, including residents and road users, was also conducted. By way of comparison, the inconsistency regarding the causes of accidents judged by the general public and engineering departments can then be well known. In addition, feasible improvements, if any, can be further proposed. The results show that Speeding, Violating rules, and Poor sight distance and visibility are the main causes of hazards. To evaluate the effectiveness of the applied countermeasures, which include setting traffic signals, markings, reflective markings, traffic signs, warning signs, cross-section adjustments, intersection yellow mesh, signs, , adjusting signal phases, a before and after analysis using accidents data maintained by Ministry of Transport and Communication was studied. Among the countermeasures, Setting up traffic signals, Adjusting signal phases are most effective. Statistically, these three measures have improvement on traffic safety. On the other hand, there is no significant improvement of installing flashing signal, and stroboscope photos.