Model Driver Screening and Evaluation Program
Volume I: Project Summary and Model Program Recommendations

 

Appendix A:
Step 3 Responses by Delphi Panel of Experts

Table 4.
Step 3 responses for Sensory (Visual) Processes Delphi, 
where each cell addresses minimum performance requirements 
for a critical dimension of functional capability (A. - D.) 
in an identified driving situation (I. - IV.)

Measure of Functional Capability: Sensory (Visual) Processes
Driving Situation A. Static Acuity (photopic) B. Static Acuity (low luminance: mesopic) C. Static Contrast Sensitivity D. Visual Field Sensitivity
I. High Speed/High Complexity

(e.g., Principal Arterials)

20/40 20/50 CS=30 @15 cpd 120° total 
(high contrast spot)
20/40 20/80 1.5 log CS 120° total
20/40 20/100 1.35 log CS 120° total
20/40 20/60 1.4 log CS H120°xV90° total
20/40 < 20/80 1.4 log CS < 1.35 log CS on Pelli Robson Chart 120° total
II. High Speed/Low Complexity 

(e.g., Freeways)

20/40 20/50 CS=30 @15 cpd 120° total 
(high contrast spot)
20/60 20/120 1.2 log CS 120° total
20/60 20/100 1.35 log CS 120° total
20/60 20/80 1.4 log CS H120°xV90° total
20/40 < 20/80 < 1.35 log CS 120° total
III. Low Speed/High Complexity 

(e.g., Downtown Streets)

20/60 20/75 CS=20 @15 cpd 140° total 
(high contrast spot)
20/40 20/80 1.5 log CS 90° total
20/40 20/100 1.35 log CS 120° total
20/60 20/80 1.4 log CS 120° total
(60° monocular)
20/40 < 20/100 < 1.35 log CS 120° total
IV. Low Speed/Low Complexity 

(e.g., Residential Streets)

20/60 20/75 CS=20 @15 cpd 140° total 
(high contrast spot)
20/80 20/160 1.2 log CS 90° total
20/60 20/100 1.35 log CS 120° total
20/60 20/100 1.4 log CS 120° total
(60° monocular)
20/60 < 20/100 < 1.20 log CS 120° total

Table 5. 
Step 3 responses for Medical Factors/Dementia Delphi, 
where each cell addresses minimum performance requirements 
for a critical dimension of functional capability (A. - C.) 
in an identified driving situation (I. - IV.)

Measure of Functional Capability: Medical Factors/Dementia
Driving Situation A. General Cognitive Function B. "Executive Functioning": (e.g., planning, reasoning, and decision making) C. Coordination of Motor Processes: 
[e.g., hand /eye (tracking) and coordination of legs to control brake and accelerator]
I. High Speed/High Complexity 

(e.g., Principal Arterials)

  • Mini-Mental Status Examination (MMSE) <18 
  • MMSE = 24 
  • Modified Mini-Mental Status Examination (3MS) = 80/100 
  • Trails B completed in 90 s 
  • Short Blessed Test with cutoff score=8 
  • Traffic Sign Recognition Tests MMSE: to pass screen, S must score at least 24, and get item 30 correct as well as all 3 of the 3 memory tasks correct 
  • MMSE with cutpoint <18 or <24
  • Trails B completed correctly by 300 sec 
  • Trails B, score 2 sd below the mean for age-appropriate samples 
  • Number Cancellation, score 2 sd below the mean for age-appropriate samples 
  • Standardized road test or simulation (e.g., Washington University Road Test) 
  • Trails B: Time to complete = 1 sd below the mean if used in license setting as a trigger for further clinical assessment; 2 s.d. below the mean if used as the stand-alone determination of impairment in license setting. 
  • Trails B: > 2 sd above (worse) age and education adjusted normative values for more exclusive criterion, >1 sd above adjusted normative values for more inclusive criterion.
  • Foot-Tapping Speed 2.5 sd below normal mean = ? rate 
  • Grooved Peg Board: dominant hand = 150 sec; non-dominant hand = 178 sec. 
  • Purdue Pegboard, score 2 sd below mean on age-appropriate norms 
  • Road test or simulator to test coordination of legs to control brake & accelerator 
  • Hand/Eye Coordination - Grooved pegboard; Mobility - Gait Speed. Cutpoints > 2 s.d. above (worse) than age appropriate norms for more exclusive; > 1 s.d. above norms for more inclusive criterion.
II. High Speed/Low Complexity (e.g., Freeways)
  • MMSE < 18 
  • MMSE < 17 
  • 3MS = 75/100
  • Trails B completed correctly by 300 sec 
  • Trails B, score 2 sd below the mean 
  • Number Cancellation, score 2 sd below the mean
  • Foot-Tapping Speed 2.5 sd below mean 
  • Grooved Peg Board: dominant hand = 150 sec; non-dominant hand = 178 sec. 
  • Purdue Pegboard, score 2 sd below mean
III. Low Speed/High Complexity (e.g., Downtown Streets)
  • MMSE < 18 
  • MMSE ≤ 17 
  • 3MS = 75/100
  • Trails B completed correctly by 300 sec 
  • Trails B, score 2 sd below the mean 
  • Number Cancellation, score 2 sd below the mean
  • Foot-Tapping Speed 2.5 sd below mean 
  • Grooved Peg Board: dominant hand = 150 sec; non-dominant hand = 178 sec. 
  • Purdue Pegboard, score 2 sd below mean
IV. Low Speed/Low Complexity (e.g., Residential Streets)
  • MMSE < 18 
  • MMSE ≤ 17 
  • 3MS = 75/100 Trails B completed in 120 s.
  • Trails B completed correctly by 300 sec 
  • Trails B, score 2 sd below the mean 
  • Number Cancellation, score 2 sd below the mean
  • Foot-Tapping Speed 2.5 sd below mean 
  • Grooved Peg Board: dominant hand = 150 sec; non-dominant hand = 178 sec. P
  • Purdue Pegboard, score 2 sd below mean

BACK  |  CONTENTS  |  NEXT