TxDOT is move all south Loop 335 traffic, between Western and Washington Streets, to the new eastbound frontage roads.
This change is set to begin Saturday, Sept. 24, at 8 a.m.
The traffic switch will allow project contractors to being construction of the Loop 335 mainlanes.
Traffic will continue to be one-lane in each direction and is anticipated to remain on the frontage road until construction on the mainlanes is completed in summer 2017.
Work will take place weather permitting.