大型重型機車需要更多的駕駛操作技能與防衛駕駛能力，然而有許多部分是目前國內駕訓考照未能提供之學習項目，因此大型重型機車開放至今，產生許多因駕駛能力不足的事故。 因此本研究透過機車駕駛行為、事故因素、駕訓考照內容與相關駕駛能力量表研究，建構大型重型機車駕駛能力量表，以試題反應理論量測駕駛人駕駛能力與試題難度，以及建立各能力構面與事故之關聯。 Driving heavy motor safely requires enhanced skills and defensive driving operational abilities; however, some of which are not mandatory in the license field test. Therefore, a number of accidents happen due to the lack of minimum driving ability requirements. This study investigates driving behavior, accident causes, driving training, driving test and driving ability to establish the relationships between the driving ability constructors and the difficulty of tested item employing item response theory.
