Research Article
The Surrogate Safety Appraisal of the Unconventional Elliptical and Turbo Roundabouts
Table 2
Minimum number of repetitions needed to obtain the desired confidence interval.
| Desired Range (CI/S) | Desired Confidence | Minimum Repetitions |
| 0,5 | 99% | 130 | 0,5 | 95% | 83 | 0,5 | 90% | 64 | 1,0 | 99% | 36 | 1,0 | 95% | 23 | 1,0 | 90% | 18 | 1,5 | 99% | 18 | 1,5 | 95% | 12 | 1,5 | 90% | 9 | 2,0 | 99% | 12 | 2,0 | 95% | 8 | 2,0 | 90% | 6 |
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