| Business | Phone |
| Traffic Smithy 1225 Nw Murray Rd # 111, Portland 97229 | (503) 641-6333 |
| Charbonneau Engineering Llc 9370 Sw Greenburg Rd # 411, Portland 97223 | (503) 293-1118 |
| Dks Assoc 1400 Sw 5th Ave # 500, Portland 97201 | (503) 243-3500 |
| Lancaster Engineering 800 Nw 6th Ave # 206, Portland 97209 | (503) 248-0313 |
| Kittelson & Assoc Inc 610 Sw Alder St # 700, Portland 97205 | (503) 228-5230 |