Here is a link to the Speedway tracks in the
US.
https://www.speedwaybikes.com/tracks/index.htm
10 or so in California, 1 in NY and 1 in Indiana.
So its a sport that is covered only in California pretty much.
I have never seen a racing news program ever cover a story
on Speedway racing here in the US. Its one of the few
motorsports that has used the same equipment for the
past 70 years or so. No brakes, one gear , no fear is
speedways motto.