HFACS ( Human Factor Analysis and Classification System ) adalah pendekatan yang telah banyak di gunakan dalam melakukan investigasi kecelakaan untuk mengetahui kelemahan dalam suatu organisasi. HFACS ini terdiri dari empat lapisan yaitu unsafe act, precondition to unsafe act, unsafe supervision dan organizational influence. Kecelakaan dapat di cegah dengan menutup lubang pada lapisan pertahanan. Prinsip HFACS ini implementasikan untuk mengidentifikasi faktor yang menjadi kelemahan pada perilaku mengemudi yang tidak aman tahun 2020 di PT. X, sebuah perusahaan minyak di wilayah Indonesia. Hasil penelitian mendapatkan bahwa pengemudi yang melakukan perilaku tidak aman merupakan pengemudi dengan

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HFACS (Human Factor Analysis and Classification System) is an approach that has been widely used in investigating accidents to find out weaknesses in an organization. This HFACS consists of four layers, namely unsafe act, precondition to unsafe act, unsafe supervision and organizational influence. Accidents can be prevented by closing holes at each defense layer. The HFACS principle is  implemented to identify factors that contribute at unsafe driving behavior at PT. X, an oil company in Indonesia. Based on research finding, drivers who commit unsafe behavior are drivers with age 44 - 55 years (77.7%), experience over 16 years (63.1%), carried out on public roads (80.6%), on the afternoon shift (81, 6%), with a position as a team member (64.1%) and in the northern part of the company (56.3%). Weaknesses at the unsafe act level are decision errors (58.3%) ie not consistently applying risk assessment and not implementing safe work procedures. Weakness at level 2 is adverse mental state (52.4%), namely lack of focus in driving. Weakness at level 3 is inadequate supervision (65%) lack of consistent level of supervision to conduct safety supervision. Weakness at level 4 is the lack of consistency in the implementation of operational processes (62.1%), namely the implementation of risk assessment in an organization