Abstract: In order to reduce safety issues caused by non-motorized vehicle users' VRI, based on Ex-TPB, a SEM of these users' AP was developed with VRI as a mediator by introducing six extended latent variables. Then, data were obtained through a survey, and psychological factors which influenced VRI and AP were studied from a perspective of social psychology. The results show that the proposed model could explain 82.6% of variance for VRI, and 75.8% of that for AP. Moral norm has obviously negative impacts on VRI, while descriptive norm, perceived behavior control, conformity tendency, attitude exert significantly positive impacts on it, but their extent of influence abate successively. Moral norm, descriptive norm, perceived behavior control, attitude not only have direct impacts on AP, but also indirect ones on AP via a mediator of VRI, and their mediating effects are significant. Conformity tendency has no significant direct effects on AP, but mainly exerts indirect effects on AP by promoting VRI.

Key words: non-motorized vehicle, extend-theory of planned behavior(Ex-TPB), violating riding intention (VRI), accident proneness (AP), structural equation model(SEM)