Branching Transition

Details

TTI Report Number - 690902 - PCL1-3

Title - "MASH Testing of Branching Transition Barrier and Barrier Mounted Sign

FHWA Letter - B-281

Temporary Concrete Barriers are used to branch off from an existing permanent concrete barrier. A Metal Branching Transition was developed to connect the Temporary Concrete Barrier to the permanent concrete barrier. The transition was tested to MASH Test Level 3. MASH tests 3-20 and 3-21 with the 1100C small passenger car and the 2270P pickup truck, respectively, were performed to evaluate the metal transitions performance. Both tests successfully satisfied MASH testing criteria.

The Branching Transition configuration included 1 Metal Branching Transition, three pinned 4m X-Bolt Temporary Concrete Barrier, and hardware. The Metal Transition was 10895mm long x 802mm high to provide a smooth transition between the permanent concrete barrier and the temporary concrete barrier.

Crash Tests Performed

MASH Test 3-20:

An 1100kg vehicle impacting the critical impact point (CIP) of the transition at a nominal impact speed and angle of 100km/hr and 25 degrees, respectively.

MASH Test 3-21:

A 2270kg pickup truck impacting the CIP of the transition at a nominal impact speed and angle of 100km/hr and 25 degrees, respectively.

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