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Citation |
Mak KK, Hille RD. Transp. Res. Rec. 1994; 1468: 68-74. |
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Copyright |
(Copyright © 1994, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing) |
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DOI |
unavailable |
PMID |
unavailable |
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Abstract |
A swing-away mailbox support was designed by the Minnesota Department of Transportation (MnDOT) for use in locales where snow and ice removal during the winter presents a problem. The Minnesota swing-away mailbox support design uses a cantilevered arm for attachment of the mailbox assembly. The cantilever arm design is intended to allow for more efficient snow plowing operation without damaging the mailbox support, which presents a maintenance problem. The design allows complete snow removal beyond the shoulder or curbline, thus reducing snow-drifting on the roadway. It is easily installed with existing highway agency equipment, can be salvaged and reinstalled, and costs considerably less than current mailbox designs approved by MnDOT. The results of four full-scale crash tests conducted on this Minnesota swing-away mailbox support and the evaluation of its impact performance are presented. The mailbox support with a single mailbox assembly was judged to have successfully met all evaluation criteria outlined in NCHRP Report 350 and the 1985 AASHTO Standard Specifications for Structural Supports for Highway Signs, Luminaires and Traffic Signals. However, the mailbox support with a triple mailbox assembly was judged to have failed to meet the evaluation criteria. Language: en |
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Keywords |
Specifications; Maintenance; Performance; Highway systems; Snow and ice removal; Impact testing; Structural design; Snow plows; Supports |