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As Segment 3 of the Loop 1604 North Expansion project reaches its final phases, the Texas Department of Transportation is beginning construction on San Antonio’s first diverging diamond interchange at the Blanco Road and Loop 1604 interchange.
This new configuration is designed to ease traffic congestion at one of the most heavily traveled corridors in the region.
The overview: Jennifer Serold, public information officer for the TxDOT's San Antonio district, said the new Blanco Road and Loop 1604 diverging diamond interchange, or DDI, will temporarily shift traffic to the left side of the road, allowing free‑flow left turns, shorter signal cycles, and safer, more efficient movement through one of the region’s busiest intersections.
Looking ahead: A full weekend closure is anticipated to occur in March, with Serold stating that the shift will not occur over March 13 so as not to interfere with spring break. TxDOT officials said the speed limit will be reduced to 35 mph during construction but will be raised back to the normal 45 mph once construction is complete.
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