On TV Indy's racing surface looks like it's smooth as glass, but take a peek at it up close:
The pavement is grooved asphalt, but better asphalt than your city fathers purchase. The friction this material can generate, with grooves, allows the speeds we're seeing. (The pencil is a reference for scale.)
By the way that scrape just above the pencil? It's the gouge Danica Patrick's car took out of the track a few years back. ;-)
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