Community News
Diverging Diamond Interchange (DDI) at the intersection of Blanco Road and Loop 1604
Posted on Mar 8th, 2026
As part of the Loop 1604 North Expansion Project, TxDOT will soon implement a Diverging Diamond Interchange (DDI) at the intersection of Blanco Road and Loop 1604. This innovative intersection design shifts traffic briefly to the left side of the roadway as drivers travel through the interchange, allowing vehicles to make free-flowing left turns without crossing opposing traffic.
Because the Loop 1604 and Blanco Road intersection is one of the most heavily traveled areas in north San Antonio, the DDI design will help improve mobility and safety in the corridor.
DDI - Click HERE for a video to learn more
Key benefits include:
· Easier travel: Free-flow left turns create smoother movements through the intersection
· Faster trips: Shorter signal cycles mean less time waiting at red lights
· Safer conditions: Fewer conflict points reduce the potential for crashes
DDI Project Timeline:
· March 2026: Traffic shifts to DDI conditions
· Spring 2026: Major roadway and bridge work complete
· Summer 2026: Final phase of construction
· Late Summer 2026: DDI is complete
Because the Loop 1604 and Blanco Road intersection is one of the most heavily traveled areas in north San Antonio, the DDI design will help improve mobility and safety in the corridor.
DDI - Click HERE for a video to learn more
Key benefits include:
· Easier travel: Free-flow left turns create smoother movements through the intersection
· Faster trips: Shorter signal cycles mean less time waiting at red lights
· Safer conditions: Fewer conflict points reduce the potential for crashes
DDI Project Timeline:
· March 2026: Traffic shifts to DDI conditions
· Spring 2026: Major roadway and bridge work complete
· Summer 2026: Final phase of construction
· Late Summer 2026: DDI is complete