ISO offers a free "preview" of the first few pages on their store page. This includes the scope, normative references, and table of contents. For many engineers, this is enough to understand the key parameters.
ISO 11898-2 is the silent workhorse behind billions of devices—from your car’s engine control unit to an industrial robot arm. Respect its detail, and your CAN bus will reward you with reliable, noise-immune communication. iso 11898-2 pdf download