In one of the mysteries solved in the report, safety advocate Sean Kane shows viewers how to see how old their tires are. If you can't watch the instructional video, check out the directions below:
On the side of your tire, near the inner ring, you should be able to find a string of letters and numbers that begins with DOT.
Follow the string to the end until you get to a series of four numbers.
Those four numbers represent a "date code" - but it's not as easy as you think
The first two numbers represent the week the tire was made, and the last two indicate the year. So a tire code that says "1303? would mean the tire was made in the thirteenth week, or the beginning of April, of 2003.
Should tires have an expiration date? TUNE IN Wednesday for more on the ABC News investigation on "Good Morning America", "World News With Diane Sawyer" and "Nightline".