It isn’t isolated and in crowded areas I find myself having to “ahem” loudly as I near a person in order to try to break their daze; yes, the demographic is somewhat consistent. Read this story from about a month ago in Montreal:
‘Distracted’ woman dies after falling between two subway cars in Montreal
http://globalnews.ca/news/514584/montreal-woman-killed-in-metro/
That is just horrid. What a beautiful girl. How sad.