ISO 26262 is optional, and some car makers (e.g. Tesla) may choose not to use it directly; but in general they use another process that they feel provides equiv

ISO 26262 is optional, and some car makers (e.g. Tesla) may choose not to use it directly; but in general they use another process that they feel provides equivalent safety properties, and feel so strongly enough that they're comfortable substantiating this in the inevitable lawsuits.