In recent years, many state departments of transportation have had to modify their approach guardrail–to–concrete bridge rail transition systems to comply with the testing requirements of NCHRP Report 350. Generally, these transition systems are designed and tested for use on high-speed roadways. Because no national transition designs have been developed and tested for lower-speed conditions, the same transition standard is typically applied to all roadways regardless of speed. The new transition designs represent a significant increase in installation cost and complexity over some previous designs that were acceptable under NCHRP Report 230. Thus, it may be cost-prohibitive to require use of the same design on all roadways. The purpose of this research was to develop a guardrail–to–concrete bridge rail transition that is suitable for use on lower-speed roadways and that is less expensive and complex than current designs for high-speed roadways. A low-cost transition was successfully evaluated under NCHRP Report 350 Test Level 2 (TL-2) impact conditions. It is considered suitable for use on roadways that have traffic conditions appropriate for the use of TL-2 safety hardware. Use of this system provides significant savings in material and installation cost compared with high-speed (i.e., TL-3) transitions.


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    Title :

    Transition from Guardrail to Concrete Bridge Rail for Low-Speed Roadways


    Additional title:

    Transportation Research Record: Journal of the Transportation Research Board


    Contributors:


    Publication date :

    2005-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Transition from Guardrail to Concrete Bridge Rail for Low-Speed Roadways

    Bligh, Roger | Transportation Research Record | 2005



    Development of Guardrail to Bridge Rail Transition

    R. P. Bligh / D. L. Sicking / H. E. Ross | NTIS | 1988


    Evaluation of Guardrail to Concrete Bridge Rail Transitions

    R. B. Bligh / W. L. Menges / R. R. Haug | NTIS | 2003


    Test Level 2 Guardrail-to-Bridge Rail Transition Compatible with 31-in. Guardrail

    R. P. Bligh, D. R. Arrington and R. Meza | Online Contents | 2013