I remember getting covered in dirt as a kid. We had a cycle speedway track near us at Tongham (Hampshire). I was once taken to watch it and wondered why nobody was down near the front where there was a really good view of the riders and bikes.
I soon found out why. It was near a bend and as soon as the riders started around it, the track was kicked up and I got covered from head to foot in cinders. It was like being sand-blasted. I dejectedly made my way back to my Dad's side. I suppose it gave the crowd something to smile at.
Edit: It looks like my cycling friend never rode at Birmingham. If you look at the bottom of the page linked to below, there's a list of places where he did. As you can see from the photo there, he took the sport up again after he retired.
https://www.speedwaybikes.com/rw/ujohn_e.htm