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Revision D November 2022
Maintenance and Repair
Inspection Frequency
Inspections are recommended as needed based upon volume of traffic and impact history. Visual
Drive-By Inspections are recommended at least once a month. Walk-Up Inspections are
recommended every six months for systems asphalt and once a year for concrete.
Visual Drive-By Inspection
1) Check to see if there is evidence of an impact. If so, a walk-up inspection will be necessary.
2) Check to see if the Cartridges appear to be off the Support Brackets. Any damaged
Cartridges will need to be replaced.
Warning:
See Cartridge placement instructions on page 38.
3) Be sure the Nose is in place.
4) Note the location and condition of the QuadGuard
®
and the date of visual drive-by
inspection.
Walk-Up Inspection
Clear and dispose of any debris on the site.
Clear and remove excessive dirt from around the Monorail and Diaphragm feet.
Bolts are tight and rust free.
Anchor bolts are securely anchored.
Ensure Diaphragm Legs are straight.
All Mushroom Washer Assemblies are properly seated.
Fender Panels and Transition Panels should nest tightly against the system.
Be sure Cartridges have not been damaged and are properly seated on their Support
Brackets. To ensure intended speed characteristics, partially crushed Cartridges (due to
low speed impacts) shall be replaced.
Make all necessary repairs as described above. See Post-Impact Instructions for more
information on next page.
To determine if a product should be replaced or is potentially reusable, a trained engineer
experienced in highway products and directed by the DOT, or other appropriate local
highway authority, must be consulted.
