Applications of the theory of planned behaviour to drivers' speeding behaviour

The theory of planned behaviour (TPB; Ajzen, 1985, 1988, 1991) provides apotentially useful approach for investigating the links between drivers' attitudes andbehaviour and for informing road safety interventions that aim to promote 'safe' driving. This paper presents a review of previous research studies in which the TPBhas been applied to drivers'speeding behaviour. Some conceptual andmethodological limitations of the studies are raised. We then summarise two studiesthat we have recently conducted to overcome these limitations and discuss theimplications for road safety

Adolescent road user behaviour : a survey of 11-16 year olds

This study was carried out to investigate the safety related behaviour of road users aged 11-16. A self-completion questionnaire was designed to measure the frequency with which children from the target population carry out 43 different road using behaviours and a number of other variables including children's beliefs about the safety of their own road using behaviour. Two thousand four hundred and thirty three children from eleven secondary schools within England completed the questionnaire in lesson time at school. Factor analysis showed that scores on the 43 behaviour items were best represented by a three-factor solution. The three factors were named unsafe road crossing behaviour, dangerous playing in the road, and planned protective behaviour. Analysis of variance and stepwise multiple regression analyses showed that demographic variables and exposure variables had statistically significant effects on how often these behaviours were carried out. More interesting was the finding that respondents had realistic perceptions of their own behaviour as road users. The more respondents believed their road using behaviour to be unsafe and irresponsible, the more often they reported carrying out road using behaviour that was undesirable from a road safety point of view. These results and their implications for road safety interventions and further research are discussed

The accident risk of motorcyclists

This report contains the findings of a study to explore and quantify the interacting influences which determine motorcyclist accident liabilities. It was conducted on behalf of Road Safety Division, Department for Transport. The study first reviewed existing data sources to investigate the trends in motorcycling accidents over the last decade or so. The main part of the study was to carry out a survey of nearly 30,000 current motorcyclists in order to explore the relationship between accident risk and variables such as annual mileage, age, experience, journey type, training, personal characteristics of the riders, and the self-reported behaviours and attitudes of the riders. The numbers of accidents reported by riders within the past 12-months of riding were modelled using generalised linear techniques to take into account factors such as mileage, age, experience, bike size and the conditions prevailing when they rode. Models of rider behaviour were developed using other statistical modelling techniques. These models investigated how attitudes/motivations/perceptions and rider style influence rider behaviour, and how rider behaviour influences the likelihood of accident involvement. The influence of age, sex and experience on attitudes and behaviours, and as direct or indirect influences on accidents were also investigated. Accident risk was also directly influenced by the number of miles ridden in the past 12-months. The report makes a number of recommendations for improving the safety of motorcycle riders

Defective Erythrocyte Pyruvate Kinase with Impaired Kinetics and Reduced Optimal Activity

A unique mutant form of erythrocyte pyruvate kinase has been found associated with chronic haemolytic anaemia in a child who is apparently doubly heterozygous for the mutant isoenzyme and for pyruvate kinase deficiency of the classical quantitative type. Clinical and laboratory findings conformed closely to those typically observed in homozygous pyruvate kinase deficiency anaemia. Assayed in fresh haemolysates, the isoenzyme exhibited reduced optimal activity ( c 45% of normal) and an increased Michaelis constant for phosphoenolpyruvate (four to five times greater than normal). The kinetic anomaly was only partially corrected by activation with fructose-1,6-disphosphate. Despite some common characteristics, this isoenzyme appears distinct from others reported in the literature and lends support to the polymorphous nature of heritable baemolytic anaemias secondary to defective pyruvate kinase.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/73844/1/j.1365-2141.1972.tb05713.x.pd

The behaviour of adolescent road users

A better understanding of what makes adolescent road users vulnerable is required to develop remedial action and to reduce the number of children killed and injured on Britain's roads. This paper reports on a comprehensive investigation into the road using behaviour that might contribute towards the safety of adolescent road users

How can we persuade adolescents to wear cycle helmets? An application of the theory of planned behaviour

This chapter provides an application of the theory of planned behaviour regarding adolescents wearing cycle helmets. Injuries to adolescent cyclists are unacceptably high but whilst cycle helmets have been found to be effective at reducing injuries to the head, brain and upper facial area, adolescent cyclists rarely wear them

Errors and violations in relation to motorcyclists' crash risk

This study was conducted to: (a) develop a questionnaire that reliably measures the behaviour of motorcyclists and (b) test which types of behaviour predict motorcyclists' crash risk. A Motorcycle Rider Behaviour Questionnaire (MRBQ), consisting of 43 items to measure the self-reported frequency of specific riding behaviours, was developed and administered to a sample of motorcyclists (N = 8666). Principal components analysis revealed a 5-factor solution (traffic errors, control errors, speed violations, performance of stunts and use of safety equipment). Generalised linear modelling showed that, while controlling for the effects of age, experience and annual mileage, traffic errors were the main predictors of crash risk. For crashes in which respondents accepted some degree of blame, control errors and speed violations were also significant predictors of crash risk. Implications of the findings are discussed in relation to deciding which countermeasures may be most effective at reducing motorcycle casualty rates

Factors affecting motorcyclists' accident risk : results from a new survey

This articlce discusses factors affecting motorcyclists' accident risk: Results from a new surve

Using the theory of planned behaviour to predict observed driving behaviour

The ability of psychosocial variables to predict driver behaviour was tested using the theory of planned behaviour (TPB; I. Ajzen, 1985) as a theoretical framework. At Time 1, participants (N=150) completed questionnaire measures of TPB variables. 1 week later, participants' behaviour was assessed using both self-reports and observations of driving speed derived from a high-fidelity driving simulator. Multiple regression analyses demonstrated that: (a) the TPB was a strong predictor of drivers' intentions and self-reported speeding behaviour, and (b) intention was the sole predictor of observed speeding behaviour. Standard and repeated events survival analyses showed that intention also predicted the maintenance of drivers' compliance with speed limits. The discussion focuses on the TPB's relationships with observed and self-reported behaviour, and the implications for designing interventions