<Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (August 2007) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (August 2007) (Learn how and when to remove this template message) </Td> </Tr> <P> After Kivilev's death, the UCI made the wearing of helmets compulsory . They had previously tried to introduce this requirement in 1991, but some riders protested this at the Paris--Nice race, so the rule was not introduced . The nature of Kivilev's death, in that he was a lead rider, in one of the top French cycling teams, racing in a top stage race, coupled with advances in helmet technology, brought the debate back to the fore and conclusively so for the UCI . Whilst many riders were initially still against compulsory helmet use, the UCI ensured the rules requiring helmets to be worn at all times would be in place for the 2003 Giro d'Italia, which started just eight weeks after Kivilev's death . Dissension to the rule was initially high, but the new rules were affirmed in October 2003 . Whilst at first the rule was loose and not tightly enforced, especially on mountain - top finishes, it has since been enforced more strictly and helmet - wearing is now ubiquitous in the peloton . </P> <Dl> <Dt> 1995 </Dt> <Dd> 1st Overall Tour of Turkey </Dd> <Dt> 1998 </Dt> <Dd> 2nd Overall Vuelta Ciclista de Chile </Dd> <Dt> </Dt> <Dd> 1st Overall Route du Sud </Dd> <Dd> 4th Overall Tour de France </Dd> <Dd> 5th Overall Critérium du Dauphiné Libéré <Dl> <Dd> 1st Stage 5 </Dd> </Dl> </Dd> </Dl>

When did helmets become mandatory in the tour de france