USDOT number lettering needs to be at least 2 inches in height and must be visible from a distance of 50 feet during the day. USDOT and other regulation numbers can be larger. It is recommended to display all of your important lettering at a height of 3” inches just to be safe, especially if you plan to cross state lines. The term “big is better” is applicable in this instance.

Example: You are a trucker from Kansas and you are delivering a load to New York City. In the state of Kansas the minimum size requirement for lettering is 2 inches but in New York City, the minimum is 3 inch lettering. If you are stopped in New York City for having lettering under 3 inches you will get a fine. So, this is why we recommend a lettering size of 3 inches to cover all grounds. Some counties or cities have different rules and regulations that the FMCSA.

In both examples below, you can see the size difference between 2 inch, 2.5 inch, 3 inch and 3.5 USDOT number lettering.

If you have any questions, one of our customer service representatives would be happy to help you.