Imagine a vast shopping mall parking lot with thousands of individual parking spots and internal lanes (representing road segments within a cluster). No matter how complex it is inside, there are usually only a few key exits to the main roads. Our goal was to identify these natural "exits" for each map cluster. For instance, the complex road network around Amsterdam Airport Schiphol (see on OpenStreetMap) has many internal roads but limited primary access points.
The young men in his videos are "roadmen", a slang term for urban youth, often associated with drug dealing, he says, and are "cultural archetypes" that he frequently features in his videos. One post portraying roadmen in Parliament got eight million views in a day, he says.
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Video evidence examined by the BBC reveals that 17-year-old Shreeyam Chaulagain - the youngest of the 19 victims - had been unarmed and was trying to leave the scene when he died.