Abstract: The development of autonomous driving faces the limitations of purely technical rationality, and the social risks it engenders necessitate forward-looking ethical regulation. Although value-sensitive design internalizes moral norms within code, the static, parallel embedding of values can easily lead to value overload and higher-order moral conflicts in extreme traffic scenarios. The ethical core for resolving algorithmic deadlock and the responsibility dilemma lies in achieving a paradigm shift from value embedding to the prioritization of ethical principles. Establishing a "lexical order" with priority constraints provides this mechanism for prioritizing ethical principles, thereby establishing a fundamental coordinate for autonomous driving to bridge the theoretical gap and achieve engineering transformation at the technical level, as well as multidimensional governance at the social level.