100+ Free CDRS Practice Questions

Explanation: A comprehensive driving evaluation has two core parts: a clinical (off-road, pre-driving) assessment of vision, perception, cognition, and physical/motor function, followed by an on-road (behind-the-wheel) assessment. The clinical portion screens driving-related abilities and guides what is tested on the road. Both components together inform recommendations.

Explanation: The UFOV is a computer-based measure of visual processing speed, divided attention, and selective attention over the area from which a person can extract information in a single glance without head or eye movements. Slowed UFOV performance is associated with increased at-fault crash risk in older drivers. It is not a measure of static acuity or motor function.

Explanation: Trails B requires alternating between numbers and letters in sequence, tapping divided attention, executive function, and mental set-shifting. Slow Trails B completion times have been linked to higher at-fault crash risk. It is widely used by driver rehabilitation specialists as a cognitive screen.

Explanation: ADReS is a screening tool that evaluates the three key functional domains for safe driving: vision (acuity and visual fields), cognition (e.g., Trails B, clock drawing), and motor/physical function (rapid pace walk, range of motion, strength). Impaired performance flags the need for further evaluation. It is not a diagnostic test.

Explanation: The rapid pace walk (e.g., 10-foot walk and return) is a quick screen of lower-extremity strength, balance, and general mobility/fragility, all of which affect a driver's ability to operate pedals and transfer safely. Slow times can indicate fall risk and physical limitations relevant to driving. It does not measure vision or memory.

Explanation: The Motor-Free Visual Perception Test (MVPT/MVPT-R) is widely used in driver rehabilitation because it assesses visual perception without requiring a motor response, isolating perceptual ability. Survey research identifies it among the most consistently used cognitive-perceptual tests in the field. It complements attention measures like the UFOV and Trails.

Explanation: An on-road evaluation must be stopped when a safety-critical error occurs that requires examiner intervention (e.g., the evaluator must use the instructor brake or steering assist to prevent a collision). Such interventions indicate the client cannot safely continue. Minor route errors or slow speed alone are documented but do not by themselves justify ending the drive.

Explanation: Homonymous hemianopia is loss of the same half of the visual field in both eyes; a left hemianopia means the driver cannot see hazards, vehicles, or pedestrians appearing on the left. Adequate central acuity does not compensate for missing field, so hazard detection and lane positioning suffer. This often requires field-loss compensation strategies and may affect licensure.

Explanation: Hemispatial (unilateral) neglect is a failure to attend to or respond to stimuli on the side opposite the lesion, classically the left side after a right-hemisphere stroke. On the road this appears as drifting left, ignoring left-side traffic and signs, and poor left-lane positioning. It is an attention/awareness deficit, not a purely sensory loss, and is a serious safety concern.

Explanation: A complete C6 spinal cord injury preserves wrist extension (extensor carpi radialis), enabling a tenodesis grasp, but lacks finger intrinsics and triceps. Drivers at this level typically use hand controls with adapted steering devices such as a tri-pin or cuff and cannot use foot pedals. Higher injuries (C4 and above) generally preclude driving.