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.



Shipping and the environment – research meets reality

Centre for Transport Studies (CTS) in co-operation with Ports of Stockholm invite you to the seminar Shipping and the environment – research meets reality.




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...


New climate-proof solutions for hard surfaces in cities

High-density road infrastructure that emphasise maximum durability and minimum maintenance create inflexible systems, which put increased stress on urban trees and lead to increased risk for flooding. Over the past five years, the ‘Climate-proof solutions for...


VTI is preparing for automated vehicles

Automation of traffic systems will lead to major changes. The European Union’s (EU) CoEXist research project began in June 2017 with the aim of preparing cities and road operators for the introduction of self-driving vehicles. The Swedish National Road and...


Vehicle Driver Monitoring: sleepiness and cognitive load

To prevent road crashes it is important to understand driver related contributing factors, which have been suggested to be the critical reason in 94 per cent of crashes. The overall aim of the project Vehicle Driver Monitoring has been to advance the...


Tomas Svensson new director-general

Tomas Svensson was today appointed Director-General of VTI. Tomas has been acting Director-General since January 2017.