INDOT has had a Composite Blockout supplier contact us about blockouts for the MGS Approach Guardrail Transition. They wanted to know if a composite blockout with dimensions 6 inch wide x 12 inch deep x 18 inch long can be used on a MGS Approach Guardrail Transition. The crash tests TRP-03-210-10 and TRP 03-291-14 seem to give guidance for dimensions of 6 inch wide x 12 inch deep x 19 inch long. Can there be any variance in the blockout dimensions and can a composite blockout with a "long" dimension of 18 inches be used? The reason they are asking is because they do not make blockouts 19 inches in length. Thank you
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