The “turbo roundabout” at the intersection of highways 25 and 156 in Hollister, Calif., on Tuesday, April 1, 2025. (Nhat V. Meyer/Bay Area News Group) ...

The 146th Street and Allisonville Road roundabout with an overpass, for example, costs an estimated $44 million. The roundabout in Fishers cost $6.8 million.

But a portion of the project, a roundabout at Dynamite Boulevard and Scottsdale Road, sparked controversy after Councilman Barry Graham blasted it on social media. "You didn't ask for it, but ...