Hitchhiking
Nature
Hitchhiking (also known as thumbing, autostop or hitching) is a means of transportation that is gained by asking individuals, usually strangers, for a ride in their car or other vehicle. The ride is usually, but not always, free. Hitchhiking has early global origins during the Great Depression, however it became notorious among hippies and beatniks during the Summer of Love in 1967, which is how many young people who did not own a vehicle were able to travel across the United States free of charge.
Source: Wikipedia
Incidence
In some countries there is a rising rate of crime associated with hitchhiking. A growing number of hitch-hikers are being killed and a large number of motorists who have picked up hitchhikers have been robbed, beaten or killed.
Broader
Type
(E) Emanations of other problems