What is a requirement for mirrors on a vehicle regarding visibility?

The requirement that mirrors on a vehicle must not be cracked or obstruct forward vision is crucial for ensuring the safety of both the driver and other road users. Cracked mirrors can distort the view, making it difficult for a driver to see clearly behind or beside them, which can lead to dangerous situations when changing lanes or merging. Similarly, obstructions can hinder a driver's ability to monitor their surroundings, increasing the risk of accidents. This focus on maintaining clarity and unobstructed views directly addresses the need for adequate visibility, contributing to safer driving conditions.

In contrast, while visibility distance requirements or mirror adjustments might seem important, they are not specifically mandated in the same way as clarity and lack of obstructions. Tinted mirrors may aid in reducing glare, but they do not directly relate to the primary function of mirrors, which is to provide an unobstructed view to the driver.