One explanation for the trend to more superhot fires is that the region, which usually has dry summers, has had significantly below normal precipitation in many recent years.

This has enabled designers to continue with the trend of reducing the steering wheel size, with the typical item now being about half the diameter of that of a normal road car.

If this trend were to continue, we lower the fraction from 20 percent to 10 percent, to allow more space to be used for normal processing.