FMVSS 111

Rear visibility

This Standard applies to MPVs, trucks and buses. It specifies requirements for the performance, number, reflective surface area, magnification, labeling and location of rearview mirrors.

Applicability:

Trucks & MPVs 10,000 GVWR or Less Yes
Trucks More than 10,000 GVWR Yes
Buses 10,000 GVWR or Less Yes
Buses More than 10,000 GVWR Yes
Trailers No 

Read the Complete Standard