Evaluation of Modified Minnesota Swing-Away Mailbox

Report Number(s): 609731-5, 609731-6

Description: The installation consisted of a mailbox and newspaper box mounted onto a swinging post assembly anchored to the ground by being set inside a 2-inch square 12‑gauge × 64-inch-long perforated steel tube, which was embedded 48 inches deep into the base.  A collar was secured to the mailbox mounting tube with a ⅜ × 3-inch-long grade 5 hex bolt, washers, and nut. Additionally, a length of proof coil chain tethered the collar to the lower leg of the mount tubing to limit rotation. The swinging post assembly located the bottom of the mailbox 43 inches above the roadway.

Test Level: 3

MASH Test Number: 3-61

Proprietary/Non-proprietary: Non-proprietary

Pass/Fail: Pass

Evaluation: Full-Scale Crash Testing

Sponsor: Washington State Department of Transportation