All those who are worried about the track surface may want to know some of the history. Spedeworth changed it from tarmac to shale to ensure the Dutch F1 drivers continued to support major events at the track. The shale was laid on top of the tarmac (I don't know how deep it is) and Spedeworth have worked hard to make it a good surface which does not rut up with the F1's on full power. I am sure they have the equipment to make the track suitable for Speedway a few days after a Stock Car meeting as Deane Wood, the boss of Spedeworth, would not want to have his stadium criticised for a poor track surface. He was a very accomplished Stock Car driver and understands how the track surface is critical in making for good racing.