Tolls are based on how far you drive and what kind of vehicle you're driving. Drivers pay a toll each time they pass through a toll plaza. Depending on where they get on or get off the road, drivers also pay a toll on certain entrance and exit ramps. Frontage roads and direct connect flyover bridges are not tolled.
Drivers with a TxTag account receive a 25% discount off the cost of tolls on Central Texas toll roads. The Dallas/Fort Worth area TollTag and the Houston EZ TAG are also accepted.