EVALUATION OF DESIGN AND RETROFIT CONCEPTS FOR SLIP-BASE SIGN SUPPORT SYSTEMS

TL;DRAbstract

In response to feedback obtained from field crews, the Texas Department of Transportation (TxDOT) routinely assesses the performance of its breakaway sign support systems and identifies areas in which design improvements can result in reduced installation and maintenance costs or improved impact behavior. This project investigated several independent issues related to the performance of small sign supports. These issues include: the effect of keeper plate thickness on the impact performance of slip-base sign supports, an evaluation of methods for retrofitting slip-base stubs which incorporate a lifting ramp or cone, and investigation of a bolt-down anchor design for direct attachment of small signs to concrete pavement or median islands. Tests determined that a 26-gauge keeper plate can be used in place of the standard 30-gauge keeper plate to help alleviate reported field problems with slip-base sign supports. Use of a 26-gauge keeper plate in a triangular slip-base small sign support

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