yeah - if you take the time to look at your speedo when you do a normal corner in RL, you'll see that 90% of them are done at... 30kph. and THAT is usually fast enough to get woman and small children screaming in the back seats... Trust me on that one.
I defy you to do a roundabout (medium sized) @ 50kph.
In south city, the hairpin should be taken at no more than 20kph, and the large long under the highway in SO6 etc... should be done at 50kph maximum.