Exploring the Energy Efficiency of Electric Vehicles with Driving Behavioral Data from a Field Test and Questionnaire

Table 2

Question loading for the eight factors.

Factor	Loadings	Questions
Factor 1: Self-confidence in driving	0.79	I can drive safely under complicated traffic conditions.
	0.74	I can respond reasonably to unexpected events.
	0.72	I can maneuver the vehicle properly as I wish.
	0.71	I have confidence in teaching newcomers to drive.
	0.68	I am skillful in backing and parking.
	0.54	I can drive normally in harsh weather (windy, foggy, rainy, snowy).
	0.42	I enjoy driving.
	-0.57	I feel nervous when driving.
	-0.43	I am worried about a traffic accident when driving.
Factor 2: Distraction in driving	0.78	I answer the phone when driving.
	0.69	I talk to my passengers when driving.
	0.62	I check my phone/iPad during the red traffic signal period.
	0.47	I pay attention to the street scenery when driving.
	-0.56	I concentrate during driving and always ignore what others say.
Factor 3: Impatience in driving	0.52	I feel upset during congestion.
	0.50	I maintain a close distance to the vehicle in front.
	0.45	I always drive fast.
	0.43	I always change lanes during congestion.
	-0.59	I give way to other vehicles if they merge into my lane.
	-0.44	I obey and have faith in traffic rules.
Factor 4: Attachment to vehicles	0.67	I can repair a vehicle by myself.
	0.52	I always watch car racing TV shows.
	0.51	I feel uncomfortable when others want to cut into my lane.
	0.45	I use a vehicle even when there are alternatives.
Factor 5: Intersection acceleration behavior	0.80	I accelerate when approaching and crossing a yellow light when there is only one vehicle in front and it is accelerating.
	0.79	I accelerate when approaching and crossing a yellow light when there is no vehicle in front.
	0.41	I feel uncomfortable when others want to cut into my lane.
Factor 6: Proactive driving behavior	0.57	I change to the expected lane early in preparation for the next intersection.
	0.52	I observe the traffic light patterns from a distance.
	0.46	I adjust my vehicle in advance when entering into a queue.
Factor 7: Rude driving	0.52	I always honk the horn to the vehicle in front in congestion.
	0.44	I brake hard when I decelerate.
	-0.47	I find it is easy to remain a proper distance from the front vehicle.
Factor 8: Rigidity in driving	0.74	I stick to my accustomed route even when the road is congested.
	-0.50	I feel annoyed when following heavy-duty vehicles like buses and vans.
	0.44	I enjoy driving.