The Formula 1 rule guards are tightening the procedure against wearing jewelry and private underwear in the cockpit.
Starting with the race in Miami at the weekend, the teams must also certify in official documents that their pilots comply with the regulations.
The German race director Niels Wittich informed the racing teams before the Grand Prix in Florida this Sunday (9:30 p.m. CEST in the FAZ live ticker for Formula 1 and on Sky) about the new measure and announced spot checks.
As early as mid-April at the race in Australia, he had emphatically reminded the drivers that jewelry and non-fireproof clothing are forbidden in the racing car.
The reason given by the world association Fia is that rings, chains or piercings could pose unnecessary obstacles for first responders and doctors in emergencies.
In addition, jewelry on the skin as a heat conductor can reduce the protective effect of overlying fireproof clothing.
"This increases the risk of burns in a fire," it says.
Last but not least, the jewelry itself carries the risk of injury and could be swallowed in the event of an accident.
According to the rules, it is also not permitted to wear standard underwear, which is allegedly still common practice for some drivers.
Only clothing that meets FIA Formula 1 standards is permitted.
Record world champion Lewis Hamilton had recently shown a lack of understanding about the crackdown by the Fia.
"I don't get why they care about these little things," said the Mercedes driver.
“I think there are personal things.
You should be able to be who you are," said the Brit.
Some of his jewelry he could not take off so easily.
"These ones on my right ear, they're literally welded in, so I'd have to clip them off or something," Hamilton said. "So stay tuned."