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                                                                   EXHIBIT 5.02


               [LETTERHEAD OF ROBINSON, BRADSHAW & HINSON, P.A.]



                                  May 23, 2001


Martin Marietta Materials, Inc.
2710 Wycliff Road
Raleigh, North Carolina  27607
Attention:  Mr. Stephen P. Zelnak, Jr.

Ladies and Gentlemen:

         We have served as North Carolina counsel to Martin Marietta Materials,
Inc. (the "Company"), and are providing this opinion letter to you at your
request in connection with the preparation and filing by the Company of a
registration statement on Form S-4 (the "Registration Statement") under the
Securities Act of 1933, as amended, with respect to the offer of $250,000,000
in aggregate principal amount of the Company's 6-7/8% Notes due April 1, 2011
(the "New Notes") in exchange for $250,000,000 in aggregate principal amount of
the Company's outstanding 6-7/8% Notes due April 1, 2011 issued on March 30,
2001 (the "Old Notes"). The New Notes and the terms and conditions of such
offer (the "Exchange Offer") are more specifically described in the
Registration Statement. The Old Notes were issued under, and the New Notes are
to be issued under, the Indenture, dated as of December 7, 1998 (the
"Indenture"), by and between the Company and First Union National Bank, as
trustee (the "Trustee"). A copy of this opinion letter is also being provided
to Willkie Farr & Gallagher, counsel assisting you in the preparation of the
Registration Statement, with the understanding that Willkie Farr & Gallagher
will rely upon this opinion letter in providing its opinion to be filed as an
exhibit to the Registration Statement.

         We have examined the articles of incorporation and the bylaws of the
Company, as incorporated by reference as Exhibits 3.01 and 3.02 to the
Registration Statement, respectively, all corporate proceedings relating to the
authorization of the Exchange Notes and the Exchange Offer and such other
documents and records, including certificates of officers of the Company and of
public officials, as we have deemed necessary in order to enable us to render
this opinion.

         Based upon the foregoing, and subject to the conditions set forth
below, we are of the opinion that:

         1.       The Company is a corporation duly incorporated and validly
existing under the laws of the State of North Carolina; and


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Martin Marietta Materials, Inc.
May 23, 2001
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         2.       The execution and delivery of the Indenture has been duly
authorized by the Company, and the Indenture constitutes a legal, valid and
binding obligation of the Company.

         3.       The New Notes have been duly authorized and, when duly
executed by the proper officers of the Company, duly authenticated by the
Trustee, and issued by the Company in accordance with the terms and conditions
of the Indenture and Exchange Offer, will constitute legal, valid and binding
obligations of the Company and will be entitled to the benefits of the
Indenture.

         The opinions expressed herein are contingent upon the Company's
articles of incorporation and bylaws not being amended after the date hereof
and prior to the issuance of any of the New Notes in any manner that would
affect the matters addressed herein.

         The foregoing opinions are limited to the laws of the State of North
Carolina and the federal laws of the United States of the type typically
applicable to transactions contemplated by the Exchange Offer, and we are
expressing no opinion as to the effect of the laws of any other jurisdiction.

         We hereby consent to being named in the Registration Statement and the
prospectus included therein, as counsel who are passing upon certain legal
matters with respect to the issuance of the New Notes and to the reference to
our name under the caption "Legal Matters" in such prospectus. We also hereby
consent to the filing of a copy of this opinion as an exhibit to the
Registration Statement. In giving such consents, we do not hereby admit that we
come within the category of persons whose consent is required under Section 7
of the Securities Act of 1933, as amended, or the rules and regulations of the
Securities and Exchange Commission.



                                              Very truly yours,

                                              ROBINSON, BRADSHAW & HINSON, P.A.

                                              /s/ Stephen M. Lynch

                                              Stephen M. Lynch

SML/mer
cc:      Willkie Farr & Gallagher
         Attention:  Mr. Michael A. Schwartz