[Si Coe]

Each team sends out a driver not currently driving to marshal.
There are 2 ways of doing that.

1) Each team only marshals their own car. If nobody turns up only that team suffers.

2) Each team covers a marshal point. Here it is important that when drivers switch over, replacement marshals arrive before the old one leaves. Laps are docked for teams not covering their marshal point.

Either way marshalling is really important and a team of good drivers who don't turn out to marshal can soon find themselves losing places.