CMC Vehicle Modifications & Driving Assessment 3 — Questions and Answers
Question 1: During a behind-the-wheel driving evaluation, the CMC observes that a client consistently brakes too early before intersections. This most likely indicates:
- Visual field deficit affecting depth perception
- Impaired processing speed reducing reaction time (Correct answer)
- Reduced lower extremity strength causing premature pedal contact
- Vestibular dysfunction affecting speed perception
Correct answer: Impaired processing speed reducing reaction time
Consistently early braking often reflects slowed processing speed, where the driver anticipates hazards earlier to compensate for delayed reaction.
Question 2: Which clinical assessment tool is most commonly used by driver rehabilitation specialists to screen for visual attention and processing speed prior to on-road evaluation?
- Mini-Mental State Examination (MMSE)
- Useful Field of View (UFOV) (Correct answer)
- Trail Making Test Part B
- Motor-Free Visual Perception Test (MVPT)
Correct answer: Useful Field of View (UFOV)
The UFOV is validated as a predictor of driving safety and directly measures divided attention and processing speed in a visual context.
Question 3: A client with Parkinson's disease is referred for a driving evaluation. The CMC should schedule the evaluation:
- Early morning before medications take effect
- During the client's 'on' medication state at peak therapeutic effect (Correct answer)
- During the client's 'off' medication state to assess worst-case function
- At a consistent time unrelated to medication schedule
Correct answer: During the client's 'on' medication state at peak therapeutic effect
Driving evaluations for Parkinson's clients should occur during the optimal 'on' medication state to assess best functional capacity.
Question 4: What is the purpose of a 'clinical' or 'pre-driving' evaluation before the on-road driving assessment?
- To satisfy insurance documentation requirements before vehicle use
- To screen for functional abilities and deficits that predict on-road performance (Correct answer)
- To determine the client's preferred adaptive equipment
- To obtain physician clearance for the on-road portion
Correct answer: To screen for functional abilities and deficits that predict on-road performance
The clinical evaluation identifies motor, cognitive, visual, and perceptual factors that predict on-road performance and guides the adaptive equipment prescription.
Question 5: A teenager with spina bifida (L3-L4 level) is undergoing a first-time driving evaluation. The CMC should prioritize assessment of:
- Cognitive readiness and visual scanning given age
- Lower extremity function and sensation for standard pedal use
- Need for hand controls given likely absence of functional pedal use (Correct answer)
- Transfer ability into and out of the driver's seat
Correct answer: Need for hand controls given likely absence of functional pedal use
L3-L4 spina bifida typically results in absent or non-functional foot/ankle motor control, making hand controls likely necessary before other assessments proceed.
Question 6: When documenting a driving evaluation recommendation, which element is most critical for justifying adaptive equipment to a funding source?
- The client's diagnosis and date of onset
- The link between specific functional deficits and the recommended equipment (Correct answer)
- The equipment manufacturer's name and model number
- The evaluator's professional credentials
Correct answer: The link between specific functional deficits and the recommended equipment
Funding sources require documented medical necessity, which means explicitly connecting the functional deficit to how the equipment compensates for it.
Question 7: A client with traumatic brain injury demonstrates impulsivity and poor hazard recognition during evaluation. The CMC's most appropriate recommendation is:
- Recommend adaptive equipment to compensate for slowed reaction time
- Recommend driving cessation pending further neuropsychological evaluation (Correct answer)
- Recommend a restricted license for daytime driving only
- Recommend additional behind-the-wheel training without physician referral
Correct answer: Recommend driving cessation pending further neuropsychological evaluation
Impulsivity and impaired hazard recognition are cognitive deficits that adaptive equipment cannot compensate for; further neuropsychological evaluation is warranted before any driving recommendation.
CMC Vehicle Modifications & Driving Assessment 3
During a behind-the-wheel driving evaluation, the CMC observes that a client consistently brakes too early before intersections.
This most likely indicates: