CMC Vehicle Modifications & Driving Assessment 2 — Questions and Answers
Question 1: Which type of hand control is most appropriate for a driver who needs simultaneous acceleration and braking capability with one hand?
- Push-right-angle hand control
- Push-pull hand control
- Tri-pin hand control
- Electronic hand control with proportional input (Correct answer)
Correct answer: Electronic hand control with proportional input
Electronic proportional hand controls allow precise modulation of both acceleration and braking simultaneously through a single input device, ideal for drivers with limited upper extremity function.
Question 2: A driver with C6 complete spinal cord injury is being evaluated. Which steering device is typically most appropriate?
- Standard steering wheel with no modification
- Spinner knob only
- Tri-pin steering device (Correct answer)
- V-grip steering device
Correct answer: Tri-pin steering device
A tri-pin device provides secure wrist/hand placement for individuals with C6 SCI who have wrist extension but limited hand grip.
Question 3: When assessing a client for left-foot accelerator use, the primary safety concern the CMC must address is:
- Pedal placement interference with the driver's left knee
- Ensuring the original right accelerator is disabled or removed (Correct answer)
- The client's ability to reach both the brake and accelerator
- Proper seat height adjustment for the modified pedal
Correct answer: Ensuring the original right accelerator is disabled or removed
The original right-side accelerator must be disabled or removed to prevent inadvertent activation when a left-foot accelerator is installed.
Question 4: Which RESNA standard primarily governs the securement of wheelchairs used as seats in motor vehicles?
- ANSI/RESNA WC-18
- ANSI/RESNA WC-19 (Correct answer)
- ANSI/RESNA WC-20
- ANSI/RESNA WC-4
Correct answer: ANSI/RESNA WC-19
ANSI/RESNA WC-19 (also aligned with ISO 7176-19) sets crashworthiness requirements for wheelchairs used as vehicle seats.
Question 5: A client reports that their powered steering system feels 'vague' after a recent vehicle modification. The most likely cause is:
- Incorrect tie-rod adjustment post-lift installation (Correct answer)
- Reduced power steering fluid pressure from aftermarket pump
- Electronic steering sensor misalignment from steering column modification
- Incorrectly calibrated torque sensor in the steering rack
Correct answer: Incorrect tie-rod adjustment post-lift installation
Lift installations that alter vehicle suspension geometry can affect tie-rod alignment, resulting in vague or imprecise steering feel.
Question 6: Under NMEDA quality assurance guidelines, an adaptive equipment dealer must retain installation documentation for a minimum of:
- 2 years
- 5 years
- 7 years (Correct answer)
- 10 years
Correct answer: 7 years
NMEDA QAP standards require that installation records be retained for a minimum of 7 years to support warranty claims, recalls, and liability documentation.
Question 7: A client with hemiplegia wants to drive using a spinner knob on the right side of the steering wheel. The CMC should first verify:
- That the client's right hand has adequate grip strength
- That the vehicle has power steering
- Whether the client's dominant hand is the affected or unaffected limb (Correct answer)
- That the spinner knob is mounted at the 12 o'clock position
Correct answer: Whether the client's dominant hand is the affected or unaffected limb
Determining which side is affected versus unaffected dictates spinner placement and which compensatory strategies will be most effective.
CMC Vehicle Modifications & Driving Assessment 2
Which type of hand control is most appropriate for a driver who needs simultaneous acceleration and braking capability with one hand?