EVALUATION OF MODIFIED MINNESOTA SWING-AWAY MAILBOX (Supplemental) (609731/Task Order CT)

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Final Report:  EVALUATION OF MODIFIED MINNESOTA SWING-AWAY MAILBOX

TTI Research Supervisor:

Roger P. Bligh

Senior Research Engineer

Texas A&M Transportation Institute

TAMU 3135

College Station, Texas 77843-3135

(979) 317-2703

[email protected]

Pooled Fund Technical Representative:

Mike Elle


ABSTRACT:

The study’s objective was to test and evaluate a modified swing-away mailbox support in accordance with MASH criteria.   Two high-speed tests (MASH Test designation 3-61) were performed to evaluate two different impact scenarios associated with the cantilevered design of the swing-away mailbox, each using a 2420-lb passenger vehicle impacting the test article at a speed of 62 mi/h.   In the first test (609731-5), the left quarter point of the vehicle was aligned with the centerline of the mailbox unit. The cantilevered design of the MnDOT swing-away mailbox potentially permits the mailbox assembly to engage the windshield of the vehicle without the front of the vehicle impacting the vertical support. The test condition evaluated whether the cantilever support prevents contact with, and limits damage to, the windshield of the impacting vehicle.  In the second test (609731-6), the right front quarter point of the vehicle was aligned with, and impacted, the vertical mailbox support. The quarter point of the vehicle was selected at the point of impact to permit evaluation of the interaction between the cantilevered arm and mailbox assembly with the windshield after release of the support from its base.   The Modified Minnesota Swing away mailbox met the performance criteria for MASH Test 3-61 whether impacting (1) the cantilever arm and mailbox assembly, and (2) the vertical mailbox support. 

Updated: May 29, 2024