Hastighetsspridning och trafiksäkerhet

Download

This study describes the state of knowledge in terms of speed distribution and traffic safety. Real changes in speed-distribution and estimated accident risk for three different traffic safety measures are studied. The aim is to gain a better understanding of the relation between speed distribution and traffic safety. The study consists of: a literature review on models for the relationship between speed and accident risk, a study on the relation between measures from the speed distribution of different traffic safety measures and a study comparing different models that estimate accident risk. The literature review shows that several studies during the 1960s and 1970s that analysed individual risks in relation to the choice of speed showed a U-shaped relationship between speed and accident risk. More recent studies suggest that the relationship is rather monotonically increasing where the slope becomes steeper for higher speeds. This means that there is an increased risk of being involved in an accident for higher speeds. However, there is no overall increased risk if you drive slower than the average speed on the road. In the second study it is shown that measures like new speed limits move the entire speed distribution towards lower speeds, but for measures like speed cameras and ISA, the speed distribution is changes most for higher speeds. In the third study, where different models that study accident risk and speed levels are compared, it is shown that models developed to estimate an individual driver's risk give an unreasonable impact on risk change compared to aggregate models such as the power model. An alternative approach to take into account a change in the speed distribution is to use the power model at an individual level. The greatest difference is obtained for higher severity injuries and measures such as speed cameras and ISA where the speed distribution changes its shape the most.

MEET US


5-6
Dec

Vision Zero for Sustainable Road Safety in the Baltic Sea Region

The conference Vision Zero for Sustainable Road Safety in the Baltic Sea Region is held i Vilnius, Lithuania. VTI is part of the organisation committé and also one of the speakers.
25-27
Aug

ICTTP 2020

ICTTP, International Conference on Traffic and Transport Psychology, is held in Gothenburg, Sweden.

LATEST NEWS


2018-10-29

International standardisation efforts have many advantages

VTI participates in several international standardisation committees. The work is important because it helps to ensure that standards can be adapted to Swedish conditions and it also provides access to valuable contacts and networks.


2018-10-24

China wants to work with the best

Through the CTS cooperation, VTI is gaining valuable research contacts with China. The country is facing major challenges in the field of road safety but also has enormous potential.


2018-10-23

VTI participated in conference on electric roads

Systems with electrified roads are a relatively new concept and many projects have been launched in recent years. To stimulate the transfer of knowledge and collaboration, the Research and Innovation Platform for Electric Roads arranged its second...


2018-10-18

ADAS&ME is tackling the interaction between people and technology

ADAS&ME is a major EU project focused on automation, the human condition and the human environment. The budget is EUR 9.6 million and VTI is the coordinator.


2018-10-05

Users contribute to the development of train simulators

Apart from advanced driving simulators, VTI has developed several variations of train simulators which are used for training, education and research. In recent years, interest has increased drastically among major actors in the railway sector, and VTI has...


2018-10-03

VR study to contribute to a better working environment for bus drivers

A study where bus drivers test autonomous driving in a VR environment may contribute to a better working environment with reduced stress on the driver and safer driving.