Your ultimate guide to the I-35 expansion through Central Austin

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An in-depth walkthrough of what TxDOT plans to do along I-35 from Ben White Boulevard to U.S. 290 East.

Construction is scheduled to start this summer on the biggest expansion of I-35 in Austin's history. The project includes tearing down the upper decks, rebuilding east-west bridges and adding at least four lanes in each direction along an 8-mile stretch of highway from U.S. 290 East to Ben White Boulevard.

Say goodbye to the upper decks. These elevated lanes opened in 1975. They'll be torn down and the highway will be widened into neighboring properties. Freeway lanes along the entire I-35 CapEx Central project would narrow. Main lanes would be 11-feet wide instead of their current width of 12 feet. Managed lanes would also be 11-feet wide.of highways in Dallas, San Antonio and Houston found people drove about 2 miles per hour slower in 11-foot-wide lanes than 12-foot-wide lanes. But narrower lanes tended to result in more crashes causing injury or death, the study found.

The blue lines represent sidewalks. Some of the sidewalks on the southbound frontage road south of Woodward Street have been labeled"From Oltorf Street to Woodward Street, the pavement of the I-35 main lanes would be upgraded from asphalt to concrete. Concrete is more expensive than asphalt, but it's more resistant to weather, supports heavier loads without grooves forming in the pavement and absorbs less heat.

But even after the Oltorf Street bridge upgrade in 2020, people on foot still have to cross"slip lanes" without any traffic signal. Slip lanes are those right-turn lanes that let drivers quickly bypass the normal intersection to turn right. They're convenient for drivers but can be dangerous for pedestrians.

The general purpose lanes would be lowered here. The managed lanes would be at about the same level as the frontage roads.A cross-section of I-35 near Woodland Avenue shows the new configuration, with lowered general purpose lanes and the managed lanes running at about the same level as the frontage roads.

Austin City Council considered but rejected a plan to spend at least $15 million on a 300-foot-wide bridge at Woodland. TxDOT will pay for the 75-foot-wide pedestrian bridge and says it might look something like this.An illustration of what the 75-foot-wide pedestrian bridge over I-35 at Woodland Avenue could look like.

TxDOT says pedestrians will have to cross underneath Riverside Drive. An apparent tunnel or walkway underneath Riverside is partially visible in this bare-bones rendering of the interchange.Sidewalks crossing Riverside Drive would go under the street. TxDOT is planning to build the Riverside Drive interchange with space for Austin's planned light-rail line. Construction on the light-rail system won't start till 2027 at the earliest.

 

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