Above is a map of the mass shootings that appeared as part of an article on "Vox." (click here) Call me crazy, but, as soon as I saw this map it looked like the interstate highway system. The California and West Coast mass shootings on this map is definitely Route 5 North and South.

The east coast, I can easily pick out Route 95 North and South and Route 85 North and South. Route 85 is more Northeast and Southwest. Then there is the southern end of I-55 North and South below I-40 East and West.

It is probably nothing except population areas. I just had to point it out. Maybe another set of eyes has more insight than mine.