Try these links then:
Arkansas http://www.arkansashighways.com/plan...s/tourist.aspx

Louisiana http://www.bikelouisiana.com (This is an "official/state" tourist site. There are links within the site to the DoT site for additional info.)

Oklahoma http://www.okladot.state.ok.us/hqdiv...emap/index.htm

Texas http://www.dot.state.tx.us/travel/