I'm reading the live commentary of today's stage of the Giro d'Italia on cyclingnews.com and I came across this:

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16:13 CEST 190km/46km to go
This [climb] is nasty: 18%. [...]

Belotti rides a bit ahead of the peloton, which starts to break up on the climb.

16:15 CEST
Pellizotti's heart rate has risen to 176/190 (92%) and he's only doing 14 km/h! That gives you an idea of how tough this climb is.
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Gee whiz, "only" ~ 9-10 mph on an 18% grade.
I hate these guys sometimes.