Effects of Highway Landscapes on Drivers’ Eye Movement Behavior and Emergency Reaction Time: A Driving Simulator Study

Table 1

Classification of highway landscapes.

Enclosure degree	Enclosure degree (D/H)	Note
enclosed space landscape	D/H <2	Both sides of the road have a landscape
semi-closed space landscape	2< D/H<4	Both sides of the road have a landscape
Semi-open space landscape	2< D/H<4	One side of the road has a landscape
Open space landscape	D/H >4	No landscape