81In addition and above all, a targeted measure of retention covering places or infrastructures which regularly receive a very high volume of visitors, or strategic places, such as airports, stations, maritime ports or tollbooth areas, allows the competent authorities to collect traffic data and, in particular, location data of all persons using, at a specific time, a means of electronic communication in one of those places. Thus, such a targeted retention measure may allow those authorities to obtain, through access to the retained data, information as to the presence of those persons in the places or geographical areas covered by that measure as well as their movements between or within those areas and to draw, for the purposes of combating serious crime, conclusions as to their presence and activity in those places or geographical areas at a specific time during the period of retention.
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