Conversation so far:
do Tour De France riders have to wear helmets
In 2003, the UCI added helmet wear to their list of rules. In 2014, they changed the rules again, allowing cyclists to forgo their helmets during the first two stages
What caused the enforcement of the rule of compulsory helmet wear in the UCI on 2003
In 2003 the UCI made helmets compulsory after race participant Andrei Kivilev had an unfortunate collision with another rider and his head injuries caused his death a short time after.
Who said that the death of Andrei Kivilev was from head injuries
Andrei Kivilev’s doctors believed that a helmet would have saved his life.
Who enforced the change of the rules to compulsory helmet wear after the 2003 Tour the France
Tour de France director Jean-Marie Leblanc called for the rules to be changed to make the sport safer.

Question: What other sports enforce the rule
Self-contained rewrite: What other sports inforce use of helmets