Correcting the Cognitive Bias for Commuting Time to Relieve the Driving Stress Level in Snow Weather Condition: A Naturalistic Driving Study in Harbin, China

Table 1

Original 14-item of the Perceived Stress Scale (PSS) and modified 7-item.

No.	Original 14-item	No.	Modified 7-item
1	In the last month, how often have you been upset because of something that happened unexpectedly?	1	When driving, how often have you been upset because of some driving events that happened unexpectedly?
2	In the last month, how often have you felt that you were unable to control the important things in your life?	2	When driving, how often have you felt that you were unable to control the vehicle?
3	In the last month, how often have you felt nervous and stressed?	3	When driving, how often have you felt nervous and stressed?
4	In the last month, how often have you dealt successfully with irritating life hassles?
5	In the last month, how often have you felt that you were effectively coping with important changes that were occurring in your life?	4	When driving, how often have you felt that you were unable to cope with the changing traffic conditions?
6	In the last month, how often have you felt confident about your ability to handle your personal problem?
7	In the last month, how often have you felt that things were going your way?
8	In the last month, how often have you found that you could not cope with all the things that you had to do?	5	When driving, how often have you found that you could not cope with the driving events?
9	In the last month, how often have you been able to control irritations in your life?
10	In the last month, how often have you felt that you were on top of things?
11	In the last month, how often have you been angered because of things that happened that were outside of your control?
12	In the last month, how often have you found yourself thinking about things that you have to accomplish?
13	In the last month, how often have you been able to control the way you spend your time?	6	When driving, how often have you felt that you were unable to control the arrival time?
14	How often have you felt that difficulties were piling up so high that you could not overcome them?	7	When driving, how often have you felt difficulties in the traffic conditions that were piling up so high that you could not overcome them?