Many car drivers in Malaysia, especially young drivers, ignore the importance of wearing seat belts. This questionnaire study employed an extended version of the theory of planned behaviour (TPB) by including habit as a new construct to explain the factors influencing the behavioural intention and expectation of young Malaysian drivers to use seat belts. A total of 398 young drivers from the state of Selangor in Malaysia participated in this study. Analyses used a covariance-based structural

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... ation modelling (CB-SEM) approach. The results showed that the variance, which indicates the intention of young Malaysian drivers to use seat belts (R2 = 0.76), is influenced by drivers' habits and three basic constructs of the TPB (attitude, subjective norms, and perceived behavioural control). The basic TPB constructs have a direct and positive impact on the intention of young Malaysian drivers to use seat belts. Drivers' habits have a positive and direct influence on their intention to use seat belts, and an indirect influence via the attitude and perceived behaviour control constructs. Drivers' habits do not influence subjective norms. The authors recommend implementing effective measures to encourage Malaysian drivers to use seat belts and ensure sustainable traffic safety.