How do I check my Ford's tire tread?

An easy way to check your tread depth is with a toonie.

Slip the toonie in between the tread blocks. If the silver part of the toonie is covered, your tires are about half worn. If the tread only reaches the words ‘CANADA’ or ‘DOLLARS’, it is time to replace your tires.  

A person measuring tread depth with a two-dollar coin

Additional Information

What do the markings on my tire mean?
What kind of tires should I have for my Ford?
How do I know if I need the tires replaced?
How do I care for and maintain the tires on my Ford?