環境中的設計大多為右利者需求導向，左利者因而於生活上有許多不便，卻鮮少有人替左利者發聲。以交通為例，有研究表示左利者有使用排檔桿的困難或可能有左右混淆的經驗，但此面向未被調查完整，故本研究意在調查現今年輕左利者在生活中交通面向之不便。而若能知道右利者如何思考左利者所遭遇的交通問題，將有契機能改善左利者於交通的方便性，故也同步進行了右利者看待左利者困難的調查研究。本研究採橫斷調查法(cross-sectional survey study) ，請左利者依自身經驗填寫問卷，右利者則以自身認為左利者可能面臨的問題來填寫。結果發現左利者認為他們在迷路、向他人說明地點時指錯方向、使用交通工具、一時之間分不清楚左右情況、車禍等項目有較高的比例出現問題，其中的迷路、向他人說明位置或地點時指錯方向等問題則容易被右利者低估。而右利者高估左利者有困難的項目則為使用交通工具、看紅綠燈秒數時左右上下顛倒、讀交通號誌字詞或句子的方向與人不同、讀交通號誌字詞時左右上下顛倒。此研究建議清楚瞭解左利者在交通方面的不便，以期未來能建立將左利者納入考量的友善交通系統。

Our environment is mostly designed for the majority, the right-handers. Left-handers experience many inconveniences in life, but only few people advocate for them. Taking traffic as an example, studies showed that left-handers had difficulties in using gearshift levers and experienced left-right confusion. However, the issue related to traffic has not been investigated sufficiently. In addition, knowing how right-handers understand about left-handers’ problems in traffic may be helpful. Therefore, this study aimed to understand how right- and left-handers perceived traffic-related inconveniences in left-handers. This study was a cross-sectional survey study. Left-handers filled out the questionnaire based on their own experience, whereas right-handers filled out the questionnaire according to their perspective of left-hander’s life. The results showed that the left-handers had the following problems: getting lost, pointing to the wrong direction to others, using transportation, instant left-right discrimination, and car accidents. Among these problems, the occurrence of pointing to the wrong direction to others and getting lost was underestimated by the right-handers. From the right-handers’ viewpoint, lefthanders had greater difficulties in using transportation and reading the direction/position. The results suggest the importance of delineating the traffic-related inconveniences in lefthanders to facilitate the design of a friendly traffic system taking into consideration of the left-handers.