1. Mott MacDonald, L.L.C.
Sub: WSP USA, Inc.
Sub: Volkert, Inc.
Sub: Rahman and Associates, Inc.
2. Moffatt & Nichol, Inc.
Sub: Modjeski and Masters, Inc.
Sub: HDR Engineering, Inc.
Sub: Huval & Associates, Inc.
Sub: Bridge Diagnostics, Inc.
Sub: Forte & Tablada, Inc.
Sub: Traffic Commander, L.L.C.
3. Modjeski and Masters, Inc.
Sub: Moffatt & Nichol, Inc.
Sub: HDR Engineering, Inc.
Sub: Huval & Associates, Inc.
Sub: Bridge Diagnostics, Inc.
Sub: Forte & Tablada, Inc.
Sub: Traffic Commander, L.L.C.
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