SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 13D

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT

TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO

RULE 13d-2(a)

(Amendment No. 3)*

T3 Motion, Inc.

(Name of Issuer)

Common Stock, par value $0.001 per share

(Title of Class of Securities)

89853X306

(CUSIP Number)

Vision Capital Advisors, LLC

20 West 55th Street, 5th Floor

New York, NY 10019

Attention: James Murray

Tel: 212.849.8237

(Name, Address and Telephone Number of Person

Authorized to Receive Notices and Communications)

May 29, 2013

(Date of Event Which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box [ ].

Note. Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d-7(b) for other parties to whom copies are to be sent.

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes.)

CUSIP No.: 89853X306

NAME OF REPORTING PERSON

Adam Benowitz

(a) ¨

(b) ¨

AF

United States

5,147,707

31.3%

IN

CUSIP No.: 89853X306

NAME OF REPORTING PERSON

Robert Thomson

(a) ¨

(b) ¨

OO

United States

25,000

0.2%

IN

CUSIP No.: 89853X306

S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

Vision Capital Advisors, LLC

(a) ¨

(b) ¨

AF

Delaware

5,147,707

31.3%

IA

CUSIP No.: 89853X306

S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

Vision Opportunity Master Fund, Ltd.

(a) ¨

(b) ¨

WC

Cayman Islands

See Item 5

See Item 5

CO

CUSIP No.: 89853X306

NAME OF REPORTING PERSON

Vision Capital Advantage Fund, L.P.

(a) ¨

(b) ¨

WC

Delaware

See Item 5

See Item 5

PN

CUSIP No.: 89853X306

NAME OF REPORTING PERSON

VCAF GP, LLC

(a) ¨

(b) ¨

AF

Delaware

See Item 5

See Item 5

OO

EXPLANATORY NOTE

This Amendment No. 3 to Schedule 13D (this “Amendment No. 3”) is being filed with respect to the beneficial ownership of the common stock, par value $0.001 per share (the “Common Stock”), of T3 Motion, Inc., a Delaware corporation (the “Company” or the “Issuer”). This Amendment No. 3 amends and restates in its entirety Item 5, of the Schedule 13D originally filed on July 1, 2011.

ITEM 5. Interest in Securities of the Issuer.

(a) The Master Fund and VCAF, collectively, (i) own 4,003,823 shares of Common Stock, (ii) have the ability to acquire 1,143,884 shares of Common Stock through the exercise or conversion of derivative securities and (iii) thus beneficially own 5,147,707 shares of Common Stock, representing 31.3% of all of the Issuer’s outstanding Common Stock. The Investment Manager and Mr. Benowitz (and the General Partner with respect to the shares of Common Stock owned by VCAF) may each be deemed to beneficially own the shares of Common Stock beneficially owned by the Master Fund and VCAF. Each disclaims beneficial ownership of such shares.

Mr. Thomson has the ability to acquire 25,000 shares of Common Stock through the exercise or conversion of derivative securities and thus beneficially owns 25,000 shares of Common Stock, representing 0.2% of all of the Issuer’s outstanding Common Stock.

The foregoing is based on 15,323,277 shares of Common Stock outstanding as of May 14, 2013 and the dates of the transactions reported hereinas reported on the Issuer’s Form 10-Q for the quarterly period ended March 31, 2013, filed on May 15, 2013.

(b) The Reporting Persons (other than Mr. Thomson) have shared power (with each other and not with any third party), to vote or direct the vote of and to dispose or direct the disposition of the 5,147,707 shares of Common Stock reported herein.

Mr. Thomson has sole power to vote or direct the vote of and to dispose or direct the disposition of the 25,000 shares of Common Stock reported herein.

(c) On May 29, 2013 the Master Fund and VCAF sold 43,115 shares and 6,885 shares at $0.101 per share on the open market, respectively. Prior to the May 29, 2013 sales, the Reporting Persons had not effected any transactions with respect to the Issuer’s Common Stock since the Schedule 13D was filed with the SEC on July 1, 2011 (“Schedule 13D”). On May 29 and 30, 2013 the Reporting Persons engaged in the following transactions on the open market with respect to the Issuer’s Common Stock:

Vision Opportunity Master Fund, Ltd.

Vision Capital Advantage Fund, L.P.

(*) Price represents the weighted average price with respect to shares purchased on this date. This transaction was executed in multiple trades at approximately $0.10. The Reporting Persons hereby undertake to provide upon request by the SEC, the issuer, or any security holder of the issuer, full information regarding the number of shares purchased at each separate price.

(†) Price represents the weighted average price with respect to shares purchased on this date. This transaction was executed in multiple trades at approximately $0.10. The Reporting Persons hereby undertake to provide upon request by the SEC, the issuer, or any security holder of the issuer, full information regarding the number of shares purchased at each separate price.

(d) Not applicable.

(e) Not applicable.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated: September 4, 2013