求翻译：The formation of transportation policy is complex due to interaction between these six parties. Such complexity results in frequent conflict between shippers, consignees, and carriers. The concern to protect public interest served as the historical justification for government involvement in economic and social regulation. The next section provides a brief review of how government regulation has changed over the years.是什么意思？

待解决 悬赏分：1 - 离问题结束还有