Linear transport infrastructures (roads, rails, waterways) are known to be a vector of spread of invasive species. Japanese knotweed s.l. is in France one of the most worrying biological invasions and raises questions about the modalities of actions that must be implemented on such specific areas. There is today no unequivocal answer to this question. We observe a diversity of perceptions and practices that is partly linked to the uncertainties about the management of this plant. There is a need of knowledge relating to these perceptions and practices towards Japanese knotweed s.l. along the linear transport infrastructures, as well as the reasons that lead to this diversity of attitudes. We conducted an online photo-questionnaire survey of French managers whose mission relates to different kind of infrastructures: national roads (DIR), rails (RFF) and waterways (VNF). The questions dealt with their perceptions and practices towards the plant and with their profession (area of intervention, mission, training …). This survey enabled to produce a map of the perceptions and practices at national scale. The first results pointed out a diversity of attitudes according to the kind of surveyed stakeholders and to the geographical area of intervention. These results underline that the management choices rely above all on individual and collective values and that the future shape of environmental action must be discussed and arbitrated between all stakeholders.