Conclusions The Timed Up- and -Go test measure appears not to be a useful measure of physical functioning for the driving outcomes included here .
The Rapid Pace Walk may be useful in studies of driving ability and exposure .
Background Improving physical functioning may be a future intervention to keep older adults driving safely longer as it can help maintain both physical and cognitive health longer .
This systematic review assesses the evidence on the association between three physical functioning measures : the Short Physical Performance Battery , the Timed Up- and -Go test , and the Rapid Pace Walk with driving outcomes in older adults .
Stability of physical assessment of older drivers over 1 year.
Older adults represent the fastest-growing population of drivers with a valid driver 's licence . Also common in this age group are multiple chronic medical conditions that may have an effect on physical function and driving ability . Determining the reliability of physical measures used to assess older drivers ' functional ability is important to identifying those who are safe to continue driving . Most previous reliability studies of clinical physical measures of health used test-retest intervals shorter than those between patient visits with a clinician . In the present study we examined a more clinical ly representative interval of 1 year to determine the stability of commonly used physical measures collected during the C and rive II prospect i ve cohort study of older drivers .  Reliability statistics indicate that the  sequential finger-thumb opposition , rapid pace walk  and the  Pelli-Robson contrast sensitivity tests  have adequate stability over 1 year . Poor stability was observed for the one-legged stance and Snellen visual acuity test . Several assessment s with nominal data ( Marottoli method [ functional neck range of motion ] , whispered voice test , range of motion and strength testing ) lacked sufficient variability to conduct reliability analyses ; however , a lack of variability between test days suggests consistency over a 1-year time frame . Our results provide evidence that specific physical measures are stable in monitoring functional ability over the course of a year
Conclusions The Timed Up- and -Go test measure appears not to be a useful measure of physical functioning for the driving outcomes included here .
The Rapid Pace Walk may be useful in studies of driving ability and exposure .
Background Improving physical functioning may be a future intervention to keep older adults driving safely longer as it can help maintain both physical and cognitive health longer .
This systematic review assesses the evidence on the association between three physical functioning measures : the Short Physical Performance Battery , the Timed Up- and -Go test , and the Rapid Pace Walk with driving outcomes in older adults .