150The limits on a measure providing for the retention of traffic and location data may also be set using a geographical criterion where the competent national authorities consider, on the basis of objective and non-discriminatory factors, that there exists, in one or more geographical areas, a situation characterised by a high risk of preparation for or commission of serious criminal offences (see, to that effect, judgment of 21 December 2016, Tele2, C‑203/15 and C‑698/15, EU:C:2016:970, paragraph 111). Those areas may include places with a high incidence of serious crime, places that are particularly vulnerable to the commission of serious criminal offences, such as places or infrastructure which regularly receive a very high volume of visitors, or strategic locations, such as airports, stations or tollbooth areas.
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