High on the boards . . . 95+ mph.

The tracks are wood, but still create large amounts of dust.  The build-up of oils leads to a slippery track.
In extreme cases, fallen riders have 2 foot slivers of wood driven into their flesh.  Jim Davis(header pic) was to survive the Motordrome Era (often known as "murderdromes") after deaths at major tracks soon lead to the closing of motordromes everywhere, one by one.  Davis went on to win at dirt track events across the country - winning the very first crowning of the national championship.