http://wandrlymagazine.com/article/roadtrips/hitchhiking/
http://www.freakonomics.com/2011/10/10/where-have-all-the-hi...
http://www.socresonline.org.uk/6/3/chesters.html
http://wandrlymagazine.com/article/roadtrips/hitchhiking/
http://www.freakonomics.com/2011/10/10/where-have-all-the-hi...
http://www.socresonline.org.uk/6/3/chesters.html