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