"If something happens it happens very, very quickly -- at about 160 mph. Once you step out from behind the barriers, the adrenalin does start to pump around the body.
"You do think 'This is a dangerous hobby.' It's slightly mad!'
"But there is a great camaraderie, we have good fun together and we're all 'expert' drivers of course!"
Many who try a marshaling taster day and choose to go through the required training quickly find themselves in it for the long-haul.
Bob Tripkovic has been volunteering since 1967 and when it comes to watching the generations of F1 drivers climb up the ranks, he has had the best seat in the house -- Silverstone's only permanent recovery vehicle.
"All the big names have ended up in the back of the truck," recalled Tripkovic. "The Sennas -- Ayrton and Bruno -- Alain Prost and Nigel Mansell. I've brought in grandsons of drivers who had broken down in the Sixties!
"We meet the drivers at the worst time [when they have crashed] but some of them are still very personable.
"I've done this in a voluntary capacity for years and years and years. I've hogged this seat for a very long time -- I expect some of the other marshals are waiting for me to retire."
When the F1 world championship began, marshals came from the ranks of various racing clubs. They could not afford to race in grands prix and so chose to still play a part in races by acting as marshals.
Today the marshals come to race tracks around the world from all walks of life and without them giving up their free time, whatever the costs, the wheels of Formula One simply could not keep turning.
The Silverstone circuit in the UK is always looking for new race marshals for all its race meetings. Those interested should contact the circuit.