Round and Round We Go

Slowing the traffic in the old neighborhood.

I encountered my first traffic roundabout in New England over 50 years ago. Navigating it was intuitive because it was a single-lane circle, and all cars had to make a right turn to enter. It wasn't obvious who had to yield to whom, but because the roundabout slowed everyone down, there were usually no accidents, and those that did occur were at low speeds.

Traffic circles have become so ubiquitous that there's even a simple one five blocks from my parents' home in Honolulu. It was installed in 2021, probably to slow the cars headed to Waiola Shave Ice.

Intersection of Hwys 156 and 25 in Gilroy (Merc)

The traffic engineers may have pushed a good thing too far with the installation of a "turbo" roundabout, whose rules are hard to learn when driving a car at highway speeds. [bold added]

When drivers first crossed this particular roadway in San Benito County last February, they encountered an intersection never before seen in California — a multi-lane “turbo roundabout” shaped like a cartoon hurricane.

And, while the turbo roundabout has a history of making intersections safer throughout Europe, here the Scandinavian rotary has led to confusion among some drivers who have been seen entering the intersection backward, hopping over lane dividers, and cutting through yield signs...

In the weeks following the opening of the roundabout, the intersection saw crashes at more than three times the rate than the year before it was built — jumping from about one accident approximately every eight days to one accident every two and a half days, on average...

But despite the spike in incidents, officials and experts said they are confident this is all part of a “learning curve” that often happens with new roundabouts, and point out that deaths and serious injuries have dropped to zero since the new intersection was completed.

Californians view themselves as smarter than people who live in the rest of the country. This is a real-world test of that hypothesis.