Please cement these back into place.

This is NOT a bad design. Scalloped or 45 degrees gives BAD DRIVERS too easy access to civilians on the sidewalk. You can replace a curb, you can't replace your loving wife, daughter, son or husband. In fact, I'd gladly see damaged cars and curbs as a result to drivers not paying attention.

The car that hit this example flipped onto the sidewalk and slid down about 100 yards in the pedestrian area. High curb flipped the car.
I agree, not so much with a curb problem. The problem is mini/micro, small diameter for the type traffic and vehicles allowed on these roads.

It would be helpful if the city engineers read and understand USDOT roundabout guide before hacking these in everywhere.

http://gpsinformation.info/roundabout/RoundaboutDesign.pdf

The overall outside diameter of a roundabout is determined by two variables (design vehicle
and design speed) and the number of circulatory lanes.
The ranges of ICD in Exhibit 1320-1 are only suggestions to start a roundabout design. The
ICD for noncircular shapes should be defined with dimensions along the X and Y axis.
Design Element Mini [1] Single-Lane Multilane
Number of Lanes 1 1 2+
Inscribed Circle Diameter [2] 45’–80’ 80’–150’ [3] 135’
Circulating Roadway Width N/A 14’–19’ 29’
Entry Widths N/A 16’–18’ 25’
Notes:
[1] Reserved for urban/suburban intersections with a 25 mph or less posted
speed.
[2] The given diameters assume a circular roundabout; adjust accordingly for
other shapes.
[3] Inscribed circle diameters of less than 100 feet may not be appropriate on
a state route.

Wow if that car hit that curb and flipped, then slid the length of a football field upside down, the only thing that would have stopped it would have been highway speed solutions.

The City of Alpharetta has resolved this request.

Thanks for fixing this issue!