| Roundabout Configuration | Typical Design Vehicle | Common Inscribed Circle Diameter Range | |
| Mini-Roundabout | SU-30 (SU-9) | 45 to 90 ft. | (14 to 27 m) |
| Single-Lane Roundabout | B-40 (B-12) | 90 to 150 ft. | (27 to 46 m) |
| WB-50 (WB-15) | 105 to 150 ft. | (32 to 46 m) | |
| WB-67 (WB-20) | 130 to 180 ft. | (40 to 55 m) | |
| Multilane Roundabout | WB-50 (WB-15) | 150 to 220 ft. | (46 to 67 m) |
| WB-67 (WB-20) | 165 to 220 ft. | (50 to 67 m) | |
| Multilane Roundabout (3 lanes) | WB-50 (WB-15) | 200 to 250 ft. | (61 to 76 m) |
| WB-67 (WB-20) | 220 to 300 ft. | (67 to 91 m) | |