Driver Selection Tests and Measurement (2012) / Chapter Skim
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From page 40... ...
OVERVIEW OF SURVEY APPROACH, ANALYSIS, AND INTERPRETATION Sampling Concept The conceptual population for the safety manager survey was North American motor carrier (truck and bus) carrier safety managers.
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From page 41... ...
All of the caveats on sample representativeness apply to all questions on both forms. Thus, none of the survey results on either form can be generalized to larger respondent groups or populations such as "North American carrier safety managers" or "experts in motor carrier safety." The value of the survey results is not based on representativeness to larger populations, but rather on respondents' answers to specific questions relative to other, similar questions (e.g., Which personal traits were rated most relevant to crash risk?
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From page 42... ...
This information is presented in chapter five. MOTOR CARRIER SAFETY MANAGER SURVEY RESULTS Factors Affecting Safety and Crash Risk Questions 1 and 2 addressed factors affecting safety and crash risk.
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Driver Personal Characteristics Questions 5–16 presented 12 driver personal traits or other characteristics and asked respondents to rate the association of each with crash risk on a five-point Likert scale, with the following instructions:
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Table 7 shows the effectiveness ratings given by users of the practice. Nonusers were instructed to leave these TABLE 5 SAFETY MANAGER LIKERT SCALE RATINGS FOR ASSOCIATIONS BETWEEN PERSONAL CHARACTERISTICS AND CRASH RISK Rating or Statistic: Personal Trait 1 2 3 4 5 N Avg.
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From page 45... ...
, personality questionnaires, and questionnaires about driving behaviors. Checking credit history and rating received the lowest average rating.
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Number of years experience as carrier safety manager or human resources manager 2 to 36 10 11.8 8.1 (34) Total years experience in commercial truck/bus operations 5 to 55 22.5 22.8 11.9 The 69 safety manager respondents claimed a combined 793 years experience as safety managers and 1,551 years experience in CMV transport.
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From page 47... ...
Driver Personal Characteristics and Potential Value of Testing Questions 5–23 presented 19 driver personal traits or conditions and asked respondents to rate the association of each with crash risk on a five-point Likert scale. The specific instructions were as follows: Driver Personal/Psychological Traits What driver characteristics are most associated with risk?
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From page 48... ...
Also, several of the personal traits on the "other expert" form were worded slightly differently than similar items on the safety manager form, based on assumption that the "other experts" would be more familiar with the traits as personality dimensions (i.e., with high and low values along a scale)
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From page 49... ...
Information About Respondents The years of motor carrier safety experience of the 34 "other expert" respondents, addressed by Question 25, ranged from 7 years to 41 years. The mean was 20.8 years.
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