As of February 26, 1977, what is true regarding inside mirrors on vehicles built on a truck chassis?

The correct answer indicates that inside mirrors on vehicles built on a truck chassis are not required. This aligns with regulations set forth in safety standards for vehicles that are categorized as trucks. Different vehicle types may have distinct requirements, and historically, while many passenger vehicles are required to have inside mirrors for safety reasons, trucks often have exemptions based on their design and intended use.

Typically, the focus for truck chassis vehicles is on external mirrors to ensure optimal visibility around the larger dimensions of the truck, which makes an inside mirror less critical. Additionally, the standards have evolved over time, but the status as of February 26, 1977, confirms the lack of necessity for an inside mirror on these types of vehicles.

While some options mention requirements, including electric mirrors or optional status, the specific regulations for truck chassis vehicles established that inside mirrors are not a mandated feature. Understanding this context helps clarify why the absence of a requirement is established in regulations pertaining to these vehicles.