my background is with adolescents (14 -17 year high school students) older than those in the OP's discussion...but the problem persists with them also... situational awareness education is not included as a measurable academic standard, and should be...

I see three common manifestations...peripheral vision blocking "hoodies", the ever popular music ear phones (ear bud) and the current "texting" phenomenon... they become self absorbed, and oblivious to personal danger ...we had several near accidents in the parking lot at school dismissal... inattention by both drivers and walking students

I included the OODA loop as part of my decision making curriculum