Driving performance features.

Driving performance features.</p

Task completion mean.

Task completion mean.</p

Single-modality classifiers.

Single-modality classifiers.</p

Relationship between difficulty level and mean task completion time.

Participants spent much time completing the task as the task difficulty level increased.</p

Feature-level fusion vs. single-modality classifiers (%).

Feature-level fusion vs. single-modality classifiers (%).</p

The structures of the data fusion methods.

A feature-level fusion (a), a decision-level fusion (b), and a hybrid-level fusion (c).</p

VR driving system.

A participant driving in the virtual system (left) and a snapshot containing the ego vehicle, sample of the driving route, intersection, and landmark within the virtual system (right).</p

Task completion time.

Task completion time.</p

Performance features and their meaning.

Performance features and their meaning.</p

Mean task completion time.

Mean sufficient and mean difficulty.</p