A book on the topic quotes: > "Note that the people drive the speed they feel comfortable with regardless of the posted speed limit if enforcement is not prese

A book on the topic quotes: > "Note that the people drive the speed they feel comfortable with regardless of the posted speed limit if enforcement is not present" - ref: https://books.google.co.jp/books?id=tF7uyw7feOMC&pg=SA13-PA13&lpg=SA13-PA13&dq=self+preservation+study+speed+driving&source=bl&ots=CX_ad1KwuD&sig=t2BwEuDTLWsWOq2FN_tghoBJDZI&hl=en&sa=X&ved=0ahUKEwj12ojukfrZAhUDU7wKHWY2CdwQ6AEIOjAB#v=onepage&q=self%20preservation%20study%20speed%20driving&f=false https://books.google.co.jp/books?id=tF7uyw7feOMC&pg=SA13-PA1... And a paper: - "PEOPLE DRIVE THE SPEED THEY ARE COMFORTABLE WITH ON GRAVEL ROADS REGARDLESS OF SPEED LIMIT, K-STATE RESEARCHERS SAY" - https://www.k-state.edu/media/newsreleases/april09/speedlimit41009.html https://www.k-state.edu/media/newsreleases/april09/speedlimi...