| # | Company name | Role | # of Projects |
|---|---|---|---|
| 1 | Arup South Africa | traffic research | 1 |
| 2 | Barton-Aschman Associates, Inc. | traffic research | 2 |
| 3 | Benshoof & Associates, Inc. | traffic research | 3 |
| 4 | Crawford, Bunte, Brammeier | traffic research | 3 |
| 5 | Dagesh Engineering - Road and Traffic Planning Ltd. | traffic research | 15 |
| 6 | Dipl.-Ing.Detlef David GmbH | traffic research | 1 |
| 7 | Dipl.-Ing. Emig | traffic research | 1 |
| 8 | Durth Roos Consulting GmbH | traffic research | 6 |
| 9 | emig-VS Ingenieurgesellschaft für Verkehrs- und Stadtplanung mbH | traffic research | 1 |
| 10 | Grebner Ruchay Verkehrsplanungs GmbH | traffic research | 0 |
| 11 | Heimann Ingenieurgesellschaft | traffic research | 1 |
| 12 | iNplan gmbh - Ingenieurgesellschaft für innovatives Planen und Bauen | traffic research | 0 |
| 13 | Short Elliott Hendrickson, Inc. | traffic research | 4 |
| 14 | Vel-Pekka Kärkkäinen | traffic research | 0 |
| 15 | Voorhees and Associates Ltd. | traffic research | 1 |
| 16 | Wells & Associates | traffic research | 10 |