But the rain runs off the track taking shale with it and then contaminating the playing surface on the inside.
Multi Sport stadiums will not entertain speedway as it makes a mess, leads to moise complaints, and a large amount of the stadium footprint is only used for a monority sport.
The way to develop new facilities is find brownfield sites where you can develop a number of motorsport activities in a model not disimiliar to the Redcar facility. However the larger the town/city tend to have the most valueable land so perhaps Speedway future is more aligned to smaller towns like Kings Lynn or Workington with between 20-50,000 locals.