 This study developed refined finite element models with asphalt surfacing to obtain predictive formulae for determining effective notch stress concentration factors, ENS-based SCFs, in orthotropic steel decks, which can be applied to practical engineering. The results show that the ENS-based SCFs are significantly affected by the transverse loading position and asphalt surfacing, and a cubic polynomial function can fit the numerical results with high precision. The study proposes predictive formulae for arbitrary transverse loading position and temperature of asphalt surfacing with a relative error within 10%, indicating the feasibility of using this approach for engineering applications. This article was authored by Chotong Wang, Shan Chunshu, Yao, and others.