<PAGE>

                                                                   EXHIBIT 10.33

                           LOAN MODIFICATION AGREEMENT

        This Loan Modification Agreement is entered into as of July 31, 2001, by
and between At Road, Inc. ("Borrower") and Silicon Valley Bank ("Bank").

1. DESCRIPTION OF EXISTING INDEBTEDNESS: Among other indebtedness which may be
owing by Borrower to Bank, Borrower is indebted to Bank pursuant to, among other
documents, a Loan and Security Agreement, dated June 30, 1999, as may be amended
from time to time, (the "Loan Agreement"). The Loan Agreement provided for,
among other things, a Committed Revolving Line in the original principal amount
of Two Million Dollars ($2,000,000). Defined terms used but not otherwise
defined herein shall have the same meanings as in the Loan Agreement.

Hereinafter, all indebtedness owing by Borrower to Bank shall be referred to as
the "Indebtedness."

2. DESCRIPTION OF COLLATERAL AND GUARANTIES. Repayment of the Indebtedness is
secured by the Collateral as described in the Loan Agreement.

Hereinafter, the above-described security documents and guaranties, together
with all other documents securing repayment of the Indebtedness shall be
referred to as the "Security Documents". Hereinafter, the Security Documents,
together with all other documents evidencing or securing the Indebtedness shall
be referred to as the "Existing Loan Documents".

3. DESCRIPTION OF CHANGE IN TERMS.

   A. Modification(s) to Loan Agreement

      1. Section 8.3 entitled "Material Adverse Change" is hereby amended in its
         entirety to read as follows:

         If there (i) occurs a material adverse change in the business,
         operations, or condition (financial or otherwise) of the Borrower, or
         (ii) is a material impairment of the prospect of repayment of any
         portion of the Obligations or (iii) is a material impairment of the
         value or priority of Bank's security interests in the Collateral.

      2. The following term under Section 13.1 entitled "Definitions" is hereby
         amended to read as follows:

         "Revolving Maturity Date" is September 30, 2001

4. CONSISTENT CHANGES. The Existing Loan Documents are hereby amended wherever
necessary to reflect the changes described above.

5. PAYMENT OF LOAN FEE. Borrower shall pay Lender a fee in the amount of Two
Hundred Fifty Dollars ($250) ("Loan Fee") plus all out-of-pocket expenses.

6. NO DEFENSES OF BORROWER. Borrower (and each guarantor and pledgor signing
below) agrees that, as of the date hereof, it has no defenses against the
obligations to pay any amounts under the Indebtedness.

7. CONTINUING VALIDITY. Borrower (and each guarantor and pledgor signing below)
understands and agrees that in modifying the existing Indebtedness, Bank is
relying upon Borrower's representations, warranties, and agreements, as set
forth in the Existing Loan Documents. Except as expressly modified pursuant to
this Loan Modification Agreement, the terms of the Existing Loan Documents
remain unchanged and in full force and effect. Bank's agreement to modifications
to the existing Indebtedness pursuant to this Loan Modification Agreement in no
way shall obligate Bank to make any future modifications to the Indebtedness.
Nothing in this Loan Modification Agreement shall constitute a satisfaction of
the


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Indebtedness. It is the intention of Bank and Borrower to retain as liable
parties all makers and endorsers of Existing Loan Documents, unless the party is
expressly released by Bank in writing. No maker, endorser, or guarantor will be
released by virtue of this Loan Modification Agreement. The terms of this
paragraph apply not only to this Loan Modification Agreement, but also to all
subsequent loan modification agreements.

8. CONDITIONS. The effectiveness of this Loan Modification Agreement is
conditioned upon payment of the Loan Fee.

This Loan Modification Agreement is executed as of the date first written above.

BORROWER:                                     BANK:

AT ROAD, INC.                                 SILICON VALLEY BANK

By: /s/ THOMAS C. HOSTER                      By: /s/ ANDRE LUM
   ------------------------------               --------------------------------
Name: Thomas C. Hoster                        Name: Andre Lum
     ----------------------------                  -----------------------------
Title: VP & CFO                               Title: Senior Relationship Manager
      ---------------------------                  -----------------------------


                                       2

<PAGE>

                           LOAN MODIFICATION AGREEMENT

This Loan Modification Agreement is entered into as of September 30, 2001, by
and between At Road, Inc. ("Borrower") and Silicon Valley Bank ("Bank").

1. DESCRIPTION OF EXISTING INDEBTEDNESS: Among other indebtedness which may be
owing by Borrower to Bank, Borrower is indebted to Bank pursuant to, among other
documents, a Loan and Security Agreement, dated June 30, 1999, as may be amended
from time to time, (the "Loan Agreement"). The Loan Agreement provided for,
among other things, a Committed Revolving Line in the original principal amount
of Two Million Dollars ($2,000,000). Defined terms used but not otherwise
defined herein shall have the same meanings as in the Loan Agreement.

Hereinafter, all indebtedness owing by Borrower to Bank shall be referred to as
the "Indebtedness."

2. DESCRIPTION OF COLLATERAL AND GUARANTIES. Repayment of the Indebtedness is
secured by the Collateral as described in the Loan Agreement.

Hereinafter, the above-described security documents and guaranties, together
with all other documents securing repayment of the Indebtedness shall be
referred to as the "Security Documents". Hereinafter, the Security Documents,
together with all other documents evidencing or securing the Indebtedness shall
be referred to as the "Existing Loan Documents".

3. DESCRIPTION OF CHANGE IN TERMS.

   A.  Modification(s) to Loan Agreement

       1.  The following term under Section 13.1 entitled "Definitions" is
           hereby amended to read as follows:

           "Revolving Maturity Date" is December 1, 2001.

4. CONSISTENT CHANGES. The Existing Loan Documents are hereby amended wherever
necessary to reflect the changes described above.

5. PAYMENT OF LOAN FEE. Borrower shall pay Lender a fee in the amount of Two
Hundred Fifty Dollars ($250) ("Loan Fee") plus all out-of-pocket expenses.

6. NO DEFENSES OF BORROWER. Borrower (and each guarantor and pledgor signing
below) agrees that, as of the date hereof, it has no defenses against the
obligations to pay any amounts under the Indebtedness.

7. CONTINUING VALIDITY. Borrower (and each guarantor and pledgor signing below)
understands and agrees that in modifying the existing Indebtedness, Bank is
relying upon Borrower's representations, warranties, and agreements, as set
forth in the Existing Loan Documents. Except as expressly modified pursuant to
this Loan Modification Agreement, the terms of the Existing Loan Documents
remain unchanged and in full force and effect. Bank's agreement to modifications
to the existing Indebtedness pursuant to this Loan Modification Agreement in no
way shall obligate Bank to make any future modifications to the Indebtedness.
Nothing in this Loan Modification Agreement shall constitute a satisfaction of
the Indebtedness. It is the intention of Bank and Borrower to retain as liable
parties all makers and endorsers of Existing Loan Documents, unless the party is
expressly released by Bank in writing. No maker, endorser, or guarantor will be
released by virtue of this Loan Modification Agreement. The terms of this
paragraph apply not only to this Loan Modification Agreement, but also to all
subsequent loan modification agreements.

8. CONDITIONS. The effectiveness of this Loan Modification Agreement is
conditioned upon payment of the Loan Fee.


<PAGE>



This Loan Modification Agreement is executed as of the date first written above.

BORROWER:                                         BANK:


At ROAD, INC.                                     SILICON VALLEY BANK

By: /s/ THOMAS C. HOSTER                          By: /s/ ANDRE LUM
  -----------------------------                     ----------------------------
Name: Thomas C. Hoster                            Name: Andre Lum
    ---------------------------                        -------------------------
Title: VP & CFO                                   Title: SVP
      -------------------------                         ------------------------

<PAGE>



                           LOAN MODIFICATION AGREEMENT

This Loan Modification Agreement is entered into as of November 5, 2001, by and
between At Road, Inc. ("Borrower") and Silicon Valley Bank ("Bank").

1. DESCRIPTION OF EXISTING INDEBTEDNESS: Among other indebtedness which may be
owing by Borrower to Bank, Borrower is indebted to Bank pursuant to, among other
documents, a Loan and Security Agreement, dated June 30, 1999, as may be amended
from time to time, (the "Loan Agreement"). The Loan Agreement provided for,
among other things, a Committed Revolving Line in the original principal amount
of Two Million Dollars ($2,000,000). Defined terms used but not otherwise
defined herein shall have the same meanings as in the Loan Agreement.

Hereinafter, all indebtedness owing by Borrower to Bank shall be referred to as
the "Indebtedness."

2. DESCRIPTION OF COLLATERAL AND GUARANTIES. Repayment of the Indebtedness is
secured by the Collateral as described in the Loan Agreement.

Hereinafter, the above-described security documents and guaranties, together
with all other documents securing repayment of the Indebtedness shall be
referred to as the "Security Documents". Hereinafter, the Security Documents,
together with all other documents evidencing or securing the Indebtedness shall
be referred to as the "Existing Loan Documents".

3. DESCRIPTION OF CHANGE IN TERMS.

   A.  Modification(s) to Loan Agreement

       1.  The following term under Section 13.1 entitled "Definitions" is
           hereby amended to read as follows:

           "Revolving Maturity Date" is December 1, 2002.

4. CONSISTENT CHANGES. The Existing Loan Documents are hereby amended wherever
necessary to reflect the changes described above.

5. PAYMENT OF LOAN FEE. Borrower shall pay Lender a fee in the amount of One
Thousand Five Hundred Dollars ($1,500) ("Loan Fee") plus all out-of-pocket
expenses.

6. NO DEFENSES OF BORROWER. Borrower (and each guarantor and pledgor signing
below) agrees that, as of the date hereof, it has no defenses against the
obligations to pay any amounts under the Indebtedness.

7. CONTINUING VALIDITY. Borrower (and each guarantor and pledgor signing below)
understands and agrees that in modifying the existing Indebtedness, Bank is
relying upon Borrower's representations, warranties, and agreements, as set
forth in the Existing Loan Documents. Except as expressly modified pursuant to
this Loan Modification Agreement, the terms of the Existing Loan Documents
remain unchanged and in full force and effect. Bank's agreement to modifications
to the existing Indebtedness pursuant to this Loan Modification Agreement in no
way shall obligate Bank to make any future modifications to the Indebtedness.
Nothing in this Loan Modification Agreement shall constitute a satisfaction of
the Indebtedness. It is the intention of Bank and Borrower to retain as liable
parties all makers and endorsers of Existing Loan Documents, unless the party is
expressly released by Bank in writing. No maker, endorser, or guarantor will be
released by virtue of this Loan Modification Agreement. The terms of this
paragraph apply not only to this Loan Modification Agreement, but also to all
subsequent loan modification agreements.

8. CONDITIONS. The effectiveness of this Loan Modification Agreement is
conditioned upon payment of the Loan Fee.


<PAGE>

This Loan Modification Agreement is executed as of the date first written above.


BORROWER:                                       BANK:

At ROAD, INC.                                   SILICON VALLEY BANK

By: /s/ THOMAS C. HOSTER                        By:   /s/ ANDRE LUM
  -----------------------------                       -------------------------
Name: Thomas C. Hoster                          Name: Andre Lum
     --------------------------                       -------------------------
Title: 11/16/01                                 Title: 11/7/01
     --------------------------                       -------------------------