What troubles construction projects nowadays is the weakness of implementing the principles of engineering ethics in professional interactions. This issue is the result of an ignored exigency surrounding the promotion of ethics throughout the engineering community. However, considering the noteworthy position of Tunnel Sadd Ariana company, it is expected that we comply with ethical guidelines and remain committed to the observation of laws, regulations, and agreements of bilateral and multilateral nature. Therefore, we feel obliged to safeguard the interests of stakeholders within national interests and compatible with ethical standards and instructions to obtain their satisfaction as well as fulfilling the company's responsibilities towards the law, employers, the engineering society, and our colleagues. We believe that our success depends on achieving our duties while preserving ethics. This will eventually lead to professional growth and further achievements alongside the increase of trust and credit we obtain from our employers and partners.