Agreed, we have yet to hear of anyone, no matter how insanely they drive, hitting limp mode on a public street. It's probably possible, in a really hot environment, if you could find enough breathing room without traffic in the way or a cop to haul you off to jail, but it's unlikely anyone can do it.
Keep in mind that cruising at highway speeds, even excessive ones, doesn't tend to ramp up oil temps much, as you're getting good airflow and the revs are relatively low. To pull off limp mode on the street, you'd have to be constantly accelerating and decelerating around small streets and corners and keeping the revs way up high, and sustain those conditions for at least 10-15 minutes straight, if not much longer, without ever giving the car a break.
Usually cops, traffic, or general common sense would prevent the limp mode on the street.
That's not to say that the oil temps we see on the street (which aren't high enough to kick in limp mode) under harder driving and/or conditions are healthy, but it's not a catastrophe either.
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