For months, Texans driving on the 8-mile portion of the U.S. 183 tollway between U.S. 290 and Texas 71 have been getting a free ride. But starting Saturday, the Central Texas Regional Mobility Authority will activate the tolls on the newly completed tollway. The total cost for a typical two-axle vehicle is $2.30 for cruising on the southern stretch of the U.S. 183 tollway in East Austin if you have a TxTag, TollTag or EX-Tag. If you don't have one of those tags, it will cost $3.45 to pay by mail.