- Christopher B. Burke Engineering, Ltd.
- Edwin Hancock Engineering Co.
- Frank Novotny & Associates, Inc.
- Ciorba Group, Inc.
- Civiltech Engineering, Inc.
- Clark Dietz Engineers
- Gewalt Hamilton Associates, Inc.
- HLR – Hampton, Lenzini and Renwick, Inc. (HLR)
- Hoefferle-Butler Engineering, Inc. (HBE)
- Illinois Department of Transportation (I.D.O.T.)
- Cook County Highway Department (C.C.H.D.)
- Dupage County Division of Transportation
- Lake County Division of Transportation
- City of Chicago Department of Transportation (C.D.O.T.)
- Joseph A. Schudt & Associates
- Knight Engineers & Architects
- Metro Transportation Group, Inc
- Robinson Engineering, Ltd
- Smith Engineering Consultants, Inc
- Stanley Consultants, Inc
- Strand Associates, Inc. Engineers
- Terra Engineering, Ltd
Red light camera manufacturers:
Street Lighting Suppliers and Manufacturer Representatives:
Traffic Signal Suppliers:
Wind turbine manufacturers and manufacturer representatives: