Exhibit 5.1

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| | 300 North LaSalle Chicago, IL 60654 United States +1 312 862 2000 www.kirkland.com | | Facsimile: +1 312 862 2200 |
June 5, 2019
YRC Worldwide Inc.
10990 Roe Avenue
Overland Park, Kansas 66211
Re: Registration Statement on FormS-8
Ladies and Gentlemen:
We are providing this letter in our capacity as special counsel to YRC Worldwide Inc., a Delaware corporation (the “Company”), in connection with the filing by the Company of a Registration Statement onForm S-8 (the “Registration Statement”) under the Securities Act of 1933, as amended (the “Act”), with the Securities and Exchange Commission (the “Commission”) covering the offering by the Company of up to 2,500,000 shares of common stock, par value $0.01 per share, of the Company (the “Plan Shares”) pursuant to the YRC Worldwide Inc. 2019 Incentive and Equity Award Plan (the “Plan”).
For purposes of this letter, we have examined such documents, records, certificates, resolutions and other instruments deemed necessary as a basis for this opinion, and we have assumed the authenticity of all documents submitted to us as originals, the conformity to the originals of all documents submitted to us as copies and the authenticity of the originals of all documents submitted to us as copies.
Based upon and subject to the foregoing qualifications, assumptions and limitations and the further limitations set forth below, we advise you that the Plan Shares are duly authorized and when (i) the Registration Statement related to the Plan Shares becomes effective under the Act and (ii) the Plan Shares have been duly issued pursuant to and in accordance with the terms and conditions of the Plan and the Company’s Amended and Restated Certificate of Incorporation, as amended to date (the “Certificate of Incorporation”), and Amended and Restated Bylaws, the Plan Shares will be validly issued, fully paid andnon-assessable.
Our opinions expressed above are subject to the qualifications that we express no opinion as to the applicability of, compliance with, or effect of any laws except the General Corporation Law of the State of Delaware.
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