Mattel created the Hot Wheels brand back in 1968, and the lives of several Autoblog writers (and readers as well) were changed forever. We're now halfway through the toy line's 40th birthday year, and, coincidentally, halfway through its Hot Wheels 40th Anniversary Road Trip.

Fans can see life-size editions of some of the most famous Hot Wheels cars, get autographs from Hot Wheels designers and, while supplies last, get a free 40th Anniversary Edition Custom Otto. You'll also be able to see that bejeweled monstrosity we told you about a few months ago that Mattel says is the most expensive Hot Wheels car ever made.

Earlier this month, the tour made stops in El Segundo, California; Wendover, Utah (pictured above); and Speed, Kansas. But there are still three chances for fans to catch the rolling birthday party. This Saturday, the Hall of Fame Museum at Indy will play host. Next Monday, the celebration is at the Automotive Hall of Fame in Dearborn, Michigan and on Sept. 5, the trip ends at the Grand Prix Festival of Watkins Glen.

[Source: Hemmings Auto Blogs]