Table 5. Ranking of the quality of the body of evidence for each driving performance outcome measure.

	Quality of body of evidence
Outcome measure	Very low 0<OGS<1	Low 1<OGS<2	Medium 2<OGS<3	High 3<OGS
Mean lateral position	*
SD a of lateral position		*
Lane crossing		*
Mean speed		*
SD of speed		*
Deviation from speed limit	*
Speed variability	*
Crash events	*

^a Standard deviation