halfway through its Hot Wheels 40th Anniversary Road Trip. Mattel created the Hot Wheels brand back in 1968, and the lives of several Autoblog writers (and readers as well) were changed forever.

For Hot Wheels' 40th anniversary, it commissioned artists to design a few concepts that would celebrate the toys' heritage, and it is now planning a U.S. tour to mark the four billionth miniature ...

Depending on the year, designer, prototypes that snuck out of the factory, or simply based on iconic cars — the most valuable ...