Why can't F1 race when it's very wet?

When the rain storms come, sessions get delayed, races get red flagged and we all wonder - why do we even have wet tyres if we can't go racing?

------------------

Patreon: https://www.patreon.com/chainbearf1
Twitter: http://twitter.com/chainbear
En Español: https://www.youtube.com/channel/UC8aJWhQTYB6PURmsXXA2Wvw/

Music: "Chess Moves" by Telegrams
https://open.spotify.com/artist/0grDIpP3AFxVBo8Va5RG50?zgvF

Видео Why can't F1 race when it's very wet? канала Chain Bear