So name a stadium that can hold speedway for 25,000 in Melbourne or any other well populated city in Australia.
Your comment makes no sense. Its like saying Cardiff is too big because only 40,000 attend a 70,000 seater stadium. .
IF there are 25,000 - 20,000 at the stadium it will look half empty which is the same as Cardiff. Both are huge stadiums. There aren't any outdoor speedways stadiums to fit that crowd. You can't win.
This would never happen but I wondered. If in all 20 heats a rider went through the tapes would it mean the track reserves get 10 rides each ? What is the rule ?