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The Manchester Driver Behavior Questionnaire
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About Manchester Driver Behavior Questionnaire
Scale Name
The Manchester Driver Behavior Questionnaire
Author Details
James Reason
Translation Availability
Not Sure
Background/Description
The Manchester Driver Behaviour Questionnaire (DBQ) was developed in 1990 by a team of researchers at the University of Manchester in the United Kingdom, led by Professor James Reason. The DBQ was designed to measure aberrant driving behaviours, which are defined as behaviours that increase the risk of a traffic accident.
Reason’s work on the DBQ was based on his model of human error, which distinguishes between errors and violations. Errors are unintentional mistakes, such as misjudging a gap in traffic or forgetting to signal. Violations are deliberate deviations from traffic rules, such as speeding, tailgating, and running red lights.
The DBQ was developed to measure both errors and violations, as well as a third category of aberrant driving behaviours known as lapses. Lapses are momentary failures of attention, such as daydreaming or drifting out of lane.
The DBQ is a self-report questionnaire that contains 50 items. Respondents are asked to rate how often they engage in each behaviour on a six-point scale from 1 (never) to 6 (nearly all the time).
The DBQ has been shown to be a reliable and valid measure of aberrant driving behaviours. It has been used in a wide range of studies, including studies of risk factors for accidents, the effects of fatigue and alcohol on driving, and the effectiveness of driver training programs.
The DBQ is often used in conjunction with other measures of driving behaviour, such as driving observation studies and on-board data recorders. This allows researchers to get a more complete picture of a driver’s behaviour and to identify the factors that contribute to risky driving.
Administration, Scoring and Interpretation
The Manchester Driver Behaviour Questionnaire (DBQ) can be administered in a variety of settings, including research laboratories, driver training schools, and workplaces. It can be administered individually or in groups.
To administer the DBQ, the administrator should first provide the respondents with a copy of the questionnaire and explain the instructions. The respondents should be asked to read each item carefully and to rate how often they engage in the behaviour on a six-point scale from 1 (never) to 6 (nearly all the time).
The respondents should be encouraged to answer all of the items honestly and accurately. They should also be assured that their responses are confidential.
Once the respondents have completed the questionnaire, the administrator can collect the questionnaires and score them. The DBQ is scored by summing the ratings for each item. The higher the total score, the more frequently the respondent engages in aberrant driving behaviours.
The DBQ can be used to compare the driving behaviours of different groups of people, such as drivers of different ages, genders, or driving experience. It can also be used to track changes in driving behaviour over time.
Here are some additional tips for administering the DBQ:
- Provide the respondents with a quiet and comfortable place to complete the questionnaire.
- Allow the respondents enough time to complete the questionnaire without feeling rushed.
- Answer any questions that the respondents may have about the questionnaire or the instructions.
- Thank the respondents for their participation.
Reliability and Validity
The Manchester Driver Behaviour Questionnaire (DBQ) has been shown to be a reliable and valid measure of aberrant driving behaviours.
Reliability refers to the consistency of a measurement. A reliable measure will produce similar results when administered to the same people on different occasions.
The DBQ has been shown to have good internal consistency, which means that the items on the questionnaire are well-correlated with each other. The DBQ also has good test-retest reliability, which means that it produces similar results when administered to the same people at different times.
Validity refers to the accuracy of a measurement. A valid measure will measure what it is intended to measure.
The DBQ has been shown to have good content validity, which means that the items on the questionnaire are relevant to the construct of aberrant driving behaviours. The DBQ also has good construct validity, which means that it is correlated with other measures of aberrant driving behaviours, such as driving observation studies and on-board data recorders.
The DBQ has also been shown to have predictive validity, which means that it can predict future driving outcomes, such as traffic accidents. For example, studies have shown that drivers with high scores on the DBQ are more likely to be involved in traffic accidents.
Available Versions
29-Items
Reference
Reason, J., Manstead, A., Stradling, S., Baxter, J., & Campbell, K. (1990). Errors and violations on the roads: a real distinction?. Ergonomics, 33(10-11), 1315-1332.
Important Link
Scale File:
Frequently Asked Questions
Q: What is the Manchester Driver Behaviour Questionnaire (DBQ)?
A: The DBQ is a self-report questionnaire that measures aberrant driving behaviours, which are defined as behaviours that increase the risk of a traffic accident.
Q: Who developed the DBQ?
A: The DBQ was developed by a team of researchers at the University of Manchester in the United Kingdom, led by Professor James Reason.
Q: How is the DBQ scored?
A: The DBQ is scored by summing the ratings for each item. The higher the total score, the more frequently the respondent engages in aberrant driving behaviours.
Q: How is the DBQ used?
A: The DBQ can be used to identify individuals who are at high risk of traffic accidents, to assess the effectiveness of driver training programs, and to evaluate the impact of new road safety interventions.
Q: Is the DBQ a reliable and valid measure of aberrant driving behaviours?
A: Yes, the DBQ has been shown to be a reliable and valid measure of aberrant driving behaviours. It has been used in a wide range of studies, and its results have been shown to be correlated with other measures of driving behaviour, such as driving observation studies and on-board data recorders.
Q: Where can I find a copy of the DBQ?
A: You can find a copy of the DBQ online. However, it is important to note that the DBQ is a research tool and is not intended to be used for diagnostic purposes. If you are concerned about your driving behaviour, you should speak to a driving instructor or other qualified professional.
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