Abstract
本研究之目的在探討夜間彎曲道路情況下，貓眼與車軸所形成之夾角大小與駕駛人對其偵測率之間的關係，並藉此評估我國貓眼檢測標準是否符合車燈光強度及人員偵測能力的需求。由於車燈的光錐呈發散型，光強度會隨著離軸角度的增大而遞減，導致彎路上貓眼回反射至駕駛者眼睛的照度亦隨之衰減，故而影響駕駛者的偵測能力。本研究佈置了兩條曲率半徑為30m 的左、右彎道，實地模擬駕駛偵測狀況。實驗時於中央分向線上每隔 1m 擺置一顆貓眼，並在外側車道擺置信號源。信號源為一長排5 顆貓眼，會隨機出現在受測者可能成功偵測的範圍，範圍內劃分為6 階偏角，每階增量為1 度。5 名受測者均視力正常且有駕駛經驗，受測車皆為自用小客車。實驗結果得出，貓眼的50% 偵測偏角在左彎道上可達31.9 度(SD=2.32度)，右彎道上可達39.1度(SD=7.2度)。以此偵測偏角換算偵測距離，並與各種道路曲率上，人車需求之0.5秒路線追蹤預留反應距離相比較。結果顯示，我國貓眼檢測標準尚能符合車燈光強度及人員偵測能力的需求。This study intended to investigate the relationship between thedetectibility for cat's eye retroreflective marker on curveroads at night and the deviation angle of car headlamps. Inaddition, the results were used to evaluate whether our CNS840418 draft fulfill with detectability requirements in realdriving condition. The investigation was conducted on twosimulated curved roads. The curved road was installed with cat's eye at 1m apart. The task was to detect the existence of thetarget.The experiment consists of left and right turn drivingtasks. Five subjects aged between 20-40, with normal correctedvision were recruited. Each was experienced driver and drovehis own sedan. The results showed that the deviation angle of50% detectibility is 31.9 degree (SD = 2.32 degree) in leftturn road and 39.1 degree (SD = 7.2 degree) in right turn road.Based on these experimental results, the detectability wasconverted to detectable threshold. With this threshold, arequired 0.5sec tracking preview time was used to check againstdetectability on various radius curved roads. The resultsindicated that out CNS 840418 draft was fulfill thedetectability requirements.