Liam McCay (born 28 February 2005) is an Irish musician from County Donegal, Ireland.

He is best known for his project Sign Crushes Motorist, although McCay has released music under multiple other pseudonyms throughout his career, including "Birth Day" and "Take Care".

In December 2023, Eli Enis of Stereogum tabbed sign crushes motorist as "one of the most popular slowcore bands on the internet".

When he was eight weeks old his family moved to Buncrana, where they have remained since.

McCay learned to play the fiddle at age eight and listened to artists such as Simon and Garfunkel and Leonard Cohen growing up.