USPS Detecting Sorting Errors 2 — Questions and Answers
Question 1: A package is addressed to '742 Evergreen Terrace, Springfield, IL 62704' but was sorted to the bin for ZIP code 62740. What type of error occurred?
- Correct sort — both ZIPs serve Springfield
- ZIP code digit transposition error (Correct answer)
- Wrong state routing error
- Street name mismatch error
Correct answer: ZIP code digit transposition error
The package was sorted to 62740 instead of 62704, which is a transposition of the last two digits causing a wrong-bin sort.
Question 2: During a manual sort, a letter addressed to 'Houston, TX' is placed in the carrier route tray for 'Austin, TX'. This is best described as:
- A carrier sequence error
- A city-level misdirection error (Correct answer)
- A ZIP code error
- A delivery point error
Correct answer: A city-level misdirection error
Placing mail destined for Houston into an Austin tray is a city-level misdirection error affecting an entire metropolitan area.
Question 3: A sorter notices that every piece of mail for '94102' was placed in the bin labeled '94120'. Both ZIPs are in San Francisco. What is the most likely consequence?
- No consequence since they are in the same city
- Delayed delivery requiring re-sorting at the destination facility (Correct answer)
- Immediate return to sender
- Automatic re-routing by the barcode sorter
Correct answer: Delayed delivery requiring re-sorting at the destination facility
Mail sorted to the wrong ZIP bin within the same city must be identified and re-sorted, causing delivery delays.
Question 4: Which detail on a mailpiece should a sorter check FIRST to confirm correct bin placement?
- Return address
- Postage amount
- Destination ZIP code (Correct answer)
- Envelope size
Correct answer: Destination ZIP code
The destination ZIP code is the primary routing indicator and should be verified first when confirming correct bin placement.
Question 5: A flat is labeled '3rd Floor, 500 Main St, Denver, CO 80203' but was sorted with mail for '500 Main St, Denver, CO 80203' without floor distinction. What error risk does this create?
- No error — the street address is sufficient
- Secondary address unit missing, risking misdelivery within the building (Correct answer)
- ZIP code error requiring return to sender
- Carrier route error sending it to the wrong building
Correct answer: Secondary address unit missing, risking misdelivery within the building
Omitting the secondary address (floor/suite/unit) from sort consideration risks the carrier delivering to the wrong unit within the building.
Question 6: An OCR machine reads '8OO Main St' (with letter O instead of zero) and routes the piece incorrectly. This is an example of:
- A carrier sequence error
- A character recognition error affecting sort accuracy (Correct answer)
- A weight-based routing error
- A postage meter error
Correct answer: A character recognition error affecting sort accuracy
OCR machines can misread characters like letter O for zero, causing the piece to be routed to an incorrect address or ZIP.
Question 7: Mail for Route 7 is mistakenly placed in the Route 1 tray. A clerk catches this before dispatch. What is the correct action?
- Leave it and note the error in a log
- Transfer the mail to the correct Route 7 tray immediately (Correct answer)
- Return all Route 1 mail to the originating facility
- Forward the misrouted piece to the postmaster
Correct answer: Transfer the mail to the correct Route 7 tray immediately
Misrouted mail caught before dispatch should be immediately transferred to the correct carrier route tray to prevent delivery failure.
