(a) The Texas Transportation Commission may designate a highway or separate roadway under the jurisdiction of the commission for one-way traffic and shall erect appropriate signs giving notice of the designation.
(b) On a roadway that is designated and on which signs are erected for one-way traffic, an operator shall drive only in the direction indicated.
(c) An operator moving around a rotary traffic island shall drive only to the right of the island.
Official text of the Texas Transportation Code as published by the Texas Legislative Council.