This study examined the factors that influence risky-riding behaviours among riders who worked in the food delivery services in Klang Valley. The expanded theory of planned behaviour was utilised as the foundation, and this study introduced two new constructs: conformity tendency and traffic environment to suit the study context. This study employed 211 food delivery riders to test the hypotheses, and a structural equation modelling approach based on the parameter estimation of partial least squares (PLS-SEM) method was used to evaluate the data. The PLS-SEM model was employed to estimate the proposed model. Based on the PLS-SEM estimation, the proposed model can explain about 67.6% and 69.0% of the factors that lead to food delivery riders’ behaviour intention and risk riding behaviour. The PLS-SEM results showed that the attitude, subjective norms, perceived behavioural control, and traffic environment have a statistically significant influence on the intention of food delivery riders related to risk riding. In addition, the behaviour intention has significant effects on risk-riding behaviour among food delivery riders in Klang Valley. Also, another analysis, a multi-group analysis, was carried out to find out any discrepancies in patterns between riders who were below 30 years old and their counterpart of riders above 30 years old. Based on these findings, a strategy that sought to lower risky riding behaviours and accidents among food delivery riders in Malaysia can be outlined.