If you are a hot shot trucker or even a professional trucker remember to follow these rules and regulations to be DOT compliant and avoid any troubles.
Your USDOT numbers must be at least 2 inches in height (larger is recommended) and it must be visible from at least 50 feet away.
The color of your lettering must also contrast with the color of your vehicle and your lettering must be on both sides.
If you have any questions, we would be more than happy to assist.