PURPOSES : The desire of drivers to increase their driving speeds is increasing in response to the technological advancements in vehicles and roads. Therefore, studies are being conducted to increase the maximum design speed in Korea to 140 km/h. The stopping sight distance (SSD) is an important criterion for acquiring sustained road safety in road design. Moreover, although the perception-reaction time (PRT) is a critical variable in the calculation of the SSD, there are not many current studies on PRT. Prior to increasing the design speed, it is necessary to confirm whether the domestic PRT standard (2.5 s) is applicable to high-speed driving. Thus, in this study, we have investigated the influence of high-speed driving on PRT. METHODS : A driving simulator was used to record the PRT of drivers. A virtual driving map was composed using UC-Win/Road software. Experiments were carried out at speeds of 100, 120, and 140 km/h while assuming the following three driving scenarios according to driver expectation: Expected, Unexpected, and Surprised. Lastly, we analyzed the gaze position of the driver as they drove in the simulated environment using Smarteye. RESULTS: Driving simulator experimental results showed that the PRT of drivers decreased as driving speed increased from 100 km/h to 140 km/h. Furthermore, the gaze position analysis results demonstrated that the decrease in PRT of drivers as the driving speed increased was directly related to their level of concentration. CONCLUSIONS : In the experimental results, 85% of drivers responded within 2.0 s at a driving speed of 140 km/h. Thus, the results obtained here verify that the current domestic standard of 2.5 s can be applied in the highways designated to have 140 km/h maximum speed

본 연구의 목적은 성별, 시-지각, 개방-기술 경험, 과제의 유형, 시각적 자극 속도가 동시적-예측 타이밍에 미치는 효과를 결정하는 것이었다. 15명의 남성과 여성이 바이옵터 시-지각 검사를 이용한 6가지 시-지각 검사와 개방기술 활동 검사지를 작성한 후에 베이신 예측 타이머를 이용하여 3가지의 서로 다른 시각적 자극 속도 조건에서 단추누르기 과제와 타격 과제에 대한 50회의 동시적 예측 타이밍 과제를 수행하였다. 그 결과 시-지각 능력과 개방기술 경험에서 남성과 여성 간의 유의한 차이가 없어, 이러한 변수들은 동시적 예측 타이밍 과제의 수행에서의 남녀차이를 설명하지 못하였다. 단추누르기 과제보다 타격 과제의 수행에서 정확성과 일관성이 높게 나타났다. 이에 대한 이론적 설명이 논의되었다.