USDOT Size Recommendations
US Department of Transportation requires businesses to display their USDOT as “USDOT” not “DOT” followed by their number. The color must have an easy to read font and must be visible from at least 50 feet away. The USDOT must be displayed on both sides of the vehicle and must displayed at all times. Magnets can be used to display your US DOT number but are not recommended since they tend to fall off at highway speeds.