Crash risk analysis during fog conditions using real-time traffic data

Yina Wu
Mohamed Abdel-Aty
Jaeyoung Lee

Low visibility conditions (fog) have significant impacts on crash risk. Previous studies have been point out that the crash severity and multi-vehicles involved crash risks are prone to increase during low visibility conditions. This study analyzed the changes of traffic characteristic and safety conditions at the fog duration. Both weather data and real-time traffic data were collected from airports at two regions in Florida. The airports provides the visibility conditions information, while the Regional Integrated Transportation Information System (RITIS) provides the traffic information. The traffic patterns analysis shows that the average 5-minute speed and the average 5-minute volume were prone to decrease during fog. In order to study changes of the crash risks under fog conditions, a “Crash Risk Increase Indicator (CRII)” was proposed to explore the differences of crash risk between fog and clear conditions. A binary logistic regression model was applied to link the CRII values with traffic flow characteristics. The results shows that the crash risks were tend to increase at ramp vicinities in fog conditions. Also, the average 5-minute volume during fog and the lane location are important factors for crash risk increase. Meanwhile, the results indicated the crash risks characteristics are different by different regions.



Cost Benefit Analysis (CBA) workshop in Stockholm

An open seminar and workshop in Stockholm will be held on 25-26 April 2018. The workshop deals with the use of CBA as a basis for decision-making in the public sector. The workshop is organized by, among others, Professor Jan-Eric Nilsson, VTI.



Modal shift for an environmental lift?

Investigations in Sweden and other countries suggest a shift of goods transport from road to rail and waterborne transport to reach environmental and climate objectives. VTI is leading a new project to investigate how the modal shift can contribute and what...


Automation and digitalisation are making rail competitive

Road transport is developing rapidly and its productivity has increased sharply. Rail transport, however, has not developed at the same rate. Automation and digitalisation are essential if rail freight in Europe is to survive.


New research is creating a driverless logistics chain

The research project Born to Drive has come up with a system that allows new cars to move, without a driver, from the production line out to the parking area prior to being transported elsewhere. The vision is to automate the entire logistics chain from...


VTI testing automation in EU project

VTI is leading a series of tests in a major EU project on automated driving. The first driving tests were carried out n a test track in Slovenia in December. The project will focus in part on acceptance among different groups in society, in part on...


Freight transportation on road and rail analysed

Freight transport accounts for a large proportion of the emissions, noise and congestion produced by road traffic. Transporting freight in larger but fewer lorries could reduce the problem. At the same time it might entail freight being diverted from more...


Millions for research into maritime transport and the environment

Maritime transport is a major source of emissions of harmful air pollutants and carbon dioxide. In a new project, a research team from the Swedish National Road and Transport Research Institute (VTI) and the University of Gothenburg has received SEK 6.4...