Many studies focus on the ubiquity of microplastics (MP) in the ecosphere. However, only a limited number of studies take into consideration tire and road wear particles (TRWP), which are generated by frictional forces at the tire-pavement interface. In fact, TRWP emissions also tend to disperse and the degree of contamination would be particularly significant when the receiving environmental compartment adjoins the road. Therefore, roadside soils are expected to represent one of the environmental matrices most durably exposed to this pollution. To assess the degree and extent of roadside impregnation, we determined the TRWP content of surface soils collected along a 200 m transect from a major road in western France. Data show strong contamination within the first few meters from the road, peaking around 4000 mg.kg-1. An exponential decrease in TRWP content was observed up to 20 m from the road edge, followed by a stabilization corresponding to background values (averaging 358 ± 77 mg.kg-1). The measurements also reveal that 13% of the TRWP in samples consist of natural rubber (NR). Since heavy-duty vehicles represent 12% of local road traffic and emit TRWP predominantly made of NR (roughly 80% by mass), the NR/TRWP ratio could serve as a proxy for estimating heavy-duty vehicle contribution to roadside contamination with TRWP. Overall, this study sheds light on the local contamination of surface soils by TRWP from road traffic, but also underscores the importance of assessing such contamination away from the direct traffic influence.