Big cities aren't necessarily unsafe.In fact, some of the safest citiesin the world are urban hubsthat boast low crime rates and high levels of safety.The Economist's 2017 safe cities index, sponsored by NEC,ranked 60 cities based on the factors of personal security, digital security, health security, and infrastructure security.Personal security takes into account urban crime, terrorism, and other violence. Digital security measures threats like cyber attacks. Health security considers healthcare access, hospitals, and emergency services. Infrastructure security looks into cities with safe buildings, roads, and bridges. The Economist analyzed 49 indicators across each aspect of security in order to come up with a score out of 100. Safer cities received higher scores.Overall, however, The Economist found that man-made dangers, like cyber threats, terrorism, and inequality-induced violence are on the rise in urban areas.No US cities cracked the very top of the listSan Francisco came closest, with a ranking of 15. On the other hand, Japan and Australia each saw two cities make the top 11.Here are the safest cities around the globe:SEE ALSO:What it's really like to work for the DEA11. Frankfurt, GermanyOverall score: 84.86Personal security ranking: 11Digital security ranking: 16Health security ranking: 3Infrastructure security ranking: 2310. Zurich, SwitzerlandOverall score: 85.2Personal security ranking: 20Digital security ranking: 19Health security ranking: 4Infrastructure security ranking: 109. Hong KongOverall score: 86.22Personal security ranking: 7Digital security ranking: 5Health security ranking: 24Infrastructure security ranking: 7See the rest of the story at Business Insider Click here to read full news..