Safer guardrail-to-bridge rail transitions

Charles F McDevitt

This paper discusses the design, testing, and development of guardrail-to-bridge rail transitions. In order to solve safety problems with

vehicles impacting the ends of bridge rails, a family of transition designs were crash tested with passenger cars in accordance with the recommendations of National Cooperative Highway Research Program (NCHRP) Report 230. These transition designs became widely used in the United States. However, when these same transition designs were crash tested with pickup trucks in accordance with the new recommendations in NCHRP Report 350, they failed due to vehicle rollovers. This paper describes how these safety problems were solved and how improved transition designs were developed that meet the various levels in NCHRP Report 350.



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...


New research programme for more efficient travel

The Swedish National Road and Transport Research Institute (VTI) is playing an important role in a major new research programme to find radical solutions leading to fewer trips and more efficient travel, along with tools to enable better use of roads and...


Simulator used to practice emergency responses safely

Emergency responses of the police, ambulance, and rescue services are associated with a high risk of accidents, but practicing them in real traffic is neither safe nor permissible. A simulator-based method developed by the Swedish National Road and Transport...


Simulation of cut-in by manually driven vehicles in platooning scenarios

A study in a VTI-driving simulator has showed that a platoon will be able to handle a cut in from a manually driven car. The results of this study have recently been presented at two conferences in Japan.



The five-year anniversary of European Road Profile Users' Group (ERPUG) Forum will take place at Ramboll head quarter, Copenhagen, Denmark October 19-20, 2017.


Self-driving buses in Sweden next year?

A self-driving, fossil-free bus. This idea might become reality through a forthcoming collaborative project involving the Swedish National Road and Transport Research Institute (VTI), Linköping University and several other participants. The project group aim...