PURPOSES : As the number of fixed traffic enforcement equipments increase rapidly, it is necessary to improve efficient operation and management plans. The aim of this study is to evaluate the factors influencing fixed traffic enforcement equipment failure. METHODS : This study utilized binary logistic regression analysis using the database provided by the Korean Road Traffic Authority to evaluate the factors affecting the failure of fixed traffic enforcement equipment. RESULTS : As a result of the evaluation of this study, the main factors affecting failure were red-light camera, old equipment, Jeju, National expressways, and equipment with low speed limits. CONCLUSIONS : This study can be used as basic data on the improvement of operation management plas for maintenance of traffic enforcement equipment. Through this study, it will be possible to establish a step-by-step plan with high efficiency comapared to the input of required manpower.

PURPOSES : This study is to analyze preference of shared personal mobility(shared e-scooter or shared bike) parking lot. The detailed purposes are as follows. Firstly, the attributes and attribute levels of shared personal mobility are developed. Based on combined attributes and attribute levels several profiles were composed. Preference data of shared personal mobility parking lot is collected through survey. Preference of shared personal mobility parking lot was analyzed using conjoint analysis. METHODS : Based on the literature review, the attributes and attribute levels that might affect behavior or intention of shared personal mobility parking were developed. Several profiles that contain combined attributes and attribute levels were created in a fractional factorial design. In order to collect preference data of shared personal mobility parking lot, online survey were proceeded. The survey participants were asked to mark preference point between point 1 and point 10. Lastly, preference of shared personal mobility parking lot was analyzed using conjoint analysis. RESULTS : Based on literature review, 5 attributes for conjoint analysis were set.(Distance between shared personal mobility parking lot and destination, Space for shared personal mobility parking lot, Location of shared personal mobility parking lot, Type of shared personal mobility parking lot, Interval of shared personal mobility parking lot). With the combination of 5 attributes and their levels, 16 random profiles were made. Online survey was proceeded with 300 participants who have used shared personal mobility. Using conjoint analysis utility and importance of each attribute has been calculated. As a result, the preference got higher when distance between parking lot and destination and intervals of parking lots are short. In addition racks are tended to be preferred and it seems to be more profer to install parking lot on buffer zone of pedestrian road instead of adjacent to private building. CONCLUSIONS : It could be important to install personal mobility parking lot considering preference of parking lot attributes in order to encourage users to use the proper parking lot instead of parking anywhere.

PURPOSES : The purpose of this study was to analyze the visibility of lanes according to the changes in the plane and longitudinal line of roads considering the horizontal and vertical diffusion angles of vehicle headlights at night. First, the visibility length of the lane was determined according to the plane linearity of the road such that it could be applied to simulation and visualization data. Second, the night vision length of the lane was established according to the longitudinal line of the road such that it could be applied to the simulation and visualization data. METHODS : In this study, each variable is first examined to consider the horizontal and vertical diffusion angles of the vehicle headlights. Second, the equation for the visibility of the lane by vehicle headlights in planar linearity is obtained, and the visibility of the lane is determined. Third, an equation is obtained for the visibility of the lane by vehicle headlights in longitudinal linearity. RESULTS : The results of this study are as follows. First, the visibility length of the lane in the section where the plane linearity of the highway existed at night was studied. In this case, the visibility length of the right and left lanes based on the vehicle decreased according to the plane linearity of the highway. Second, the visibility length of the lane in the section where the longitudinal line of the highway existed at night was investigated. In this case, the visibility length of the lane decreased according to the change in the longitudinal line of the highway. CONCLUSIONS : Considering the horizontal and vertical diffusion angles, the visibility length of the lane was determined according to the changes in the plane and vertical line of the road. It can be applied to simulation and visualization data. In general, the visibility length considering the spread angle of the vehicle headlights was shorter than the visibility length of the lane by the headlights; roads must be designed in consideration with the above result.

PURPOSES : Aiming to evaluate the consistency of road markings at night, the luminance values of road markings at night were compared for merging and diverging areas. METHODS : To evaluate the consistency of road marking at nighttime in merging and diverging areas, the highway geometric structures and luminance of the road markings were collected and analyzed together at the merging and diverging areas. "Luminance" in this study referred to the overall luminance of the road markings as reflected together from surrounding lights, such as moonlight or artificial lights. The luminance of the road markings 90 m ahead of the driver were used. The measured luminance values were analyzed based on the difference ratios and an analysis of variance. RESULTS : Based on a grouping of three categories (interchanges (ICs), merging, and diverging areas), it was found that the difference ratios and analysis of variance values from the ICs and merging and diverging areas were not consistently acceptable. CONCLUSIONS : After evaluating the consistency of road markings at night in the merging and diverging areas, it can be concluded that there is a need for more consistency in the luminance on merging and diverging areas on highways. To enhance consistency, more dedicated lighting guidance for merging and diverging areas on highway areas may be necessary.