Depends a lot on the condition of the concrete. New is pretty good; old, cracked, and potholed isn't. And then there was I80 west of Donner Summit a few years ago, where traffic had worn ruts deep enough that I worried about high-centering the Insight on them.
I think fresh, smooth-rolled asphalt is actually the best. (Just seat-of-the-pants opinion from driving the Insight on various surfaces.) Unfortunately it never stays smooth very long :-(
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