1. Gresham Smith
sub Intelligent Transportation Systems, L.L.C.
sub Quality Counts, L.L.C.
sub Grey Engineering, LLC
2. Neel-Schaffer, Inc.
sub Vectura Consulting Services, L.L.C.
3. Arcadis U.S., Inc.
sub Intelligent Transportation Systems LLC
sub Bonton Associates L.L.C.
sub Gram Traffic Counting, Inc.
sub Southern Traffic Services, Inc.
4. Stantec Consulting Services, Inc.
sub Grey Engineering, LLC
sub Quality Counts, L.L.C.
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