: Lane splitting is the practice of riding a powered two-wheelers between lanes when the traffic is slow or vehicles are stopped (Sperley et Pietz, 2010). Although lane splitting is not allowed everywhere in France, it is a common riding practice among motorcyclist drivers. As transport policy is a key driver for promoting sustainable and safe transport, a first experiment (2015-2018) was conducted in eleven departments where a secure form of lane splitting was allowed on highways and urban expressways (Eyssartier et al., 2018). A second experiment is conducted since 2021 in ten new departments with eight specific conditions regulating this practice. The aim of this article is to present the results of this second experiment by analyzing the social acceptability of this road safety policy. This involves studying acceptability and therefore identifying the factors impacting the general attitude towards the measure and the behavioral intention to comply with the rules, based on the Unified Theory of Acceptance a[...]