What is one requirement for applying a sticker to a vehicle?

The requirement to press firmly until tight when applying a sticker to a vehicle is important because it ensures that the sticker adheres properly to the surface. A properly applied sticker is crucial for visibility and durability, as it helps to prevent the sticker from peeling off or becoming damaged by weather conditions or car washes. If a sticker is not securely placed, it may fall off or become difficult to read, which could lead to issues with law enforcement or during inspections. This requirement focuses on the physical action needed to guarantee that the sticker remains in place for the entire duration of its validity.