<PAGE>
                                                                    Exhibit 14

                                  [SWIFT LOGO]

                         Swift Transportation Co., Inc.

                         Code of Professional Conduct


Swift Transportation Co., Inc.'s mission includes promotion of professional
conduct in the practice of all employees, officers, and board members throughout
the Company. One of our values is that all employees are held to the highest
standards of veracity. We are honest and ethical in all our business dealings,
starting with how we treat each other. We keep our promises and admit our
mistakes. Our personal conduct ensures that Swift will be there to deliver your
future. Swift employees, officers, and board members hold an important and
elevated role in corporate governance in that they are uniquely capable and
empowered to ensure that all stakeholders' interests are appropriately balanced,
protected and preserved. This Code provides principles to which Swift's
employees, officers, and board members are expected to adhere and advocate. They
embody rules regarding individual and peer responsibilities, as well as
responsibilities to other employees, the public and other stakeholders.
Employees, officers, and board members are expected to abide by this Code as
well as any other applicable Swift policies or guidelines in the employee
handbook relating to the areas covered by this Code.

The Company's employees, officers, and board members will:

     1. Act with honesty, integrity and ethical conduct, including the ethical
        handling of actual or apparent conflicts of interest between personal
        and professional relationships.  Compliance with this provision means
        that transactions involving conflicts of interest shall be approved by
        the appropriate person or, if required by the Company's policies or SEC
        rules, by the Board of Directors or committee of directors.  Provided
        appropriate approvals are obtained in accordance with the Company's and
        the SEC's policies and rules, a conflict of interest transaction will be
        considered to be in compliance with this Code and not a waiver of the
        Code.

     2. Provide stakeholders with full, fair, accurate, timely, and
        understandable disclosure in reports and documents that a registrant
        files with, or submits to, the SEC and in other public communications
        made by the registrant.

     3. Comply with applicable rules and regulations of federal, state,
        provincial and local governments, and other appropriate private and
        public regulatory agencies.

     4. Act in good faith, responsibly, with due care, competence and diligence,
        without misrepresenting material facts or allowing one's independent
        judgment to be subordinated.
<PAGE>
     5. Maintain the confidentiality of information obtained in the course of
        one's work except when authorized or otherwise legally obligated to
        disclose.

     6. Ensure that confidential information acquired in the course of one's
        work is not used for personal advantage.

     7. Obtain adequate training and share knowledge applicable to one's duties
        and responsibilities to Swift and its stakeholders.

     8. Proactively promote and be an example of ethical behavior among peers,
        in the work environment and in the community.

     9. Achieve accountability of and control over all assets and resources
        engaged or entrusted in the course of one's work.

    10. Report promptly to Swift's corporate counsel, the audit committee or
        other appropriate personnel all violations of the code of which you
        become aware.  Reports of unethical or illegal conduct or any types of
        behavior that is a breach of company policy or a state or federal
        offense may be reported through the Swift 800 Tipline (1-877-261-6622).
        Calls may be anonymous and will be directed to Internal Audit.  All
        reports will be thoroughly and effectively investigated.  In conjunction
        with Federal Law, the Company does not tolerate retribution, retaliation
        or adverse personnel action of any kind for reports made in good faith.

     Any violations of the Code may result in disciplinary action, up to and
     including immediate termination.  Some violations could result in fines,
     imprisonment and civil liability.

     Any amendment or waiver of the Code for executive officers and directors
     may only be made by the Company's Board of Directors and must be reported
     within 5 business days after making the amendment or granting the waiver,
     including an explanation for the waiver.  Disclosure will be made either in
     a Form 8-K or through the Company website, as the Board of Directors may
     determine