"Settle Down" (Goin' Down the at Highway), by *"Mike Settle, Essex Music Inc., ASCAP."
Lyrics here- http://www.peterpaulandmary.com/music/02-01.htm

* Could not find listed at ASCAP.

The song is listed in Settle's bio. at http://www.lazyka.com/linernotes/persone/Settle.htm

First release on album "Folk Sing Hallelujah", Mike Settle and the Settlers, 1961
http://www.secondhandsongs.com/work/122558