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FACTORS INFLUENCING DRIVERS’ SPEEDING BEHAVIOUR Henriette Wallén Warner @. ”This must never happen again!” Coroner, 1896. Speed. The power model (Nilsson, 2000) U-shaped relationship (Solomon, 1964). Risk Perception. ISA - Intelligent Speed Adaptation.
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FACTORS INFLUENCINGDRIVERS’ SPEEDING BEHAVIOURHenriette Wallén Warner@
Speed The power model (Nilsson, 2000) U-shaped relationship (Solomon, 1964)
ISA- Intelligent Speed Adaptation Technical systems that are intended to help drivers keep the right speed
Different typs of ISA • informative • warning • intervening • overtaking
ISA- in Sweden • Swedish National Road Administration • 1999-2002 • 4500 vehicles • 4 cities
Borlänge- 400 vehicles- 700 km of roads • Informed • Warned • Logged
Theory of Planned Behaviour(TPB) Behavioural Beliefs Attitude Normativa Beliefs Subjective Norm Intention Behaviour Control Beliefs Perceived Behavioural Control (Ajzen, 1991)
Results Attitude R2 =.39 R2 =.28 .22 -.34 Self-Reported Behaviour Observed Behaviour Perceived Behavioural Control .37 -.29 .57 -.39 .27 Subjective Norm .23 χ2 [df = 2, N = 112 ] = 2.01; p = .37; RMSEA = .008 LISREL
Conclusion The study demonstrated that the TPB, with some modifications, can be used to predict and understand drivers’ intention and everyday speeding behaviour
Results - obstructing(N=145-161) Urban Fast traffic rythmDrivers close behindBeing in a hurry Rural Fast traffic rythmDrivers close behindGood roads
Results - facilitating(N=145-161) UrbanIncreased accident riskPeople along the roads Speed reducing measures (humps) Rural Serious consequences People living along the roads Large penalties
Results • intention(N=145-161) Urban Shorter travel times Increased risk of losing driving licence People along the roads Passing a speed sign Rural Shorter travel times Easier to over take Contribute to a stressful traffic environment Relatives and friends People living along the roads Passing a speed sign Being in a hurry
Countermeasures information/education enforcement(negative or positive) physical measures(road or invehicle)
Conclusions Initially the informing ISA speed-warning device reduces the amount of time drivers spend speeding - but this effect decreases with time
Driving Experience Feeling controlled *** Safety in traffic Attention of pedestrians Travel time in urban areas * Irritation in traffic ** Stress in traffic
Driving Behaviour Feeling of being in the way Looking at the speedometer *** Need for paying attention Feeling of frustration Feeling of time pressure Need for effort Need for accelerating/braking Being a better driver **
Acceptance of ISA(van der Laan, 1997) Usefulness Satisfaction
Where is ISA most desirable? at schools and day nurseries with 30 km/h at schools and day nurseries with 50 km/h housing estates with 30 km/h in urban areas with 30 km/h in housing estates with 50 km/h in rural areas with 70 km/h in urban areas during night time in rural areas with 90 km/h in rural areas with 110 km/h on highways with 110 km/h
For Whom is ISA most desirable? drivers who have repeatedlybeen convicted for speeding drivers who recently received their driving licence young private drivers commercial drivers transporting children to school bus drivers taxi drivers truck drivers all commercial drivers elderly private drivers all private car drivers
Speed Reducing Measure Urban areas * Rural areas
Global Perspective(WHO, 2004) Globally2004: 1.2 million killedVulnerable road users (especially elderly, children and disabled) in low- and middle-income countries shoulder a large proportionHigh income countries27% decrease of road traffic deaths between 2004 and 2020Low and middle income countries83% increase of road traffic deaths between 2004 and 2020
Sweden (n=37) -25 : 325-50 : 2250- : 1231 men; 6 women Nigeria (n=28)-25 : 125-50: 2150- : 428 men; 0 women
Drivers and Taxis SwedenExtensive trainingNew taxis (00-06; M=05) Nigeria25% lacks trainingOlder taxis (84-04; M=93)
Accidents SwedenSpeedingAlcohol or drugsReckless driving NigeriaBad roads Reckless drivingSpeeding
Fate Sweden Nigeria22% 83%
Conclusion The focus of traffic safety research has to shift from the road users in high-income countries to the road users in low- and middle-income countries
FRÅGOR?? Henriette Wallén Warner @