Round Rock gets area’s first ‘diverging diamond’ intersection

Groundbreaking of the new 'diverging diamond' intersection in Round Rock.

ROUND ROCK, Texas (KXAN) — Round Rock officials celebrated the beginning of construction on the area’s first diverging diamond at Interstate 35 and RM 1423.

The nearly $7 million earmarked for the project will cover the cost of rebuilding the intersection, improve ramps in the area and add sidewalks.

Diverging Diamond Generic
Example of how a diverging diamond intersection will look. (Click to enlarge)

Transportation officials say diverging diamonds are effective at intersections with a lot of left-turning traffic because it allows thru traffic and left turns to move simultaneously and eliminates the need for left turn arrows. Drivers are then able to bypass the intersection without stopping at a signal light.

This diverging diamond is the first of several projects aimed at improving I-35 through Williamson County.

“We’re trying to do everything we can to try to expand University (Boulevard) in conjunction with the changes to the intersection and get traffic moving through this entire corridor a lot better,” said Round Rock Mayor Alan McGraw.

The intersection was chosen because of the high volume of traffic passes through there each day. Texas Department of Transportation officials say that number is almost 40,000 vehicles on a given day.

This is the first diverging diamond in this area. The only other one in Texas is in El Paso. provides commenting to allow for constructive discussion on the stories we cover. In order to comment here, you acknowledge you have read and agreed to our Terms of Service. Users who violate these terms, including use of vulgar language or racial slurs, will be banned. If you see an inappropriate comment, please flag it for our moderators to review.

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