Can your employer legally alter a sun visor in large commercial dump truck?

No, your employer cannot legally alter a sun visor in a large commercial dump truck. The Federal Motor Carrier Safety Regulations (FMCSRs) specify the requirements for sun visors in commercial motor vehicles. These regulations state that sun visors must be installed on all commercial motor vehicles with a gross vehicle weight rating (GVWR) of over 10,000 pounds, and that they must meet certain specifications for size, shape, and location.

Specifically, FMCSR §393.83(b) states that: "Sun visors shall be installed on all commercial motor vehicles except school buses. The visor shall be at least 5 inches deep and shall extend across the entire width of the cab."

Therefore, your employer cannot legally alter the sun visor in your large commercial dump truck if the alteration violates these regulations. If you are concerned that your employer is violating these regulations, you can contact the Federal Motor Carrier Safety Administration (FMCSA) to report the issue.