Deskripsyon
These very large chunks of curb end up in the road about once a week. I and other motorist have to stop and place them back to the fractured area. This is very dangerous and no way to swerve around them while in the roundabout. The curbing is bad design with tall 90 degree wall that cars slam into often. (This is an example). Why was the curb not more scalloped or 45 degrees? Also the circumference of these roundabouts is way to small. You need some round in it to get about without bouncing off curbs.
7 Komentos
Kinilala City of Alpharetta (Beripikadong Opisiyal)
ast (Rehistradong User)
Hamboard (Rehistradong User)
ast (Rehistradong User)
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.
Hamboard (Rehistradong User)
Isinara City of Alpharetta (Beripikadong Opisiyal)
ast (Rehistradong User)