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Compare grid with address/carrier route directory deliveries:
Potential Problems Common to Carrier Routes

A
: The dashed red line is a road constructed after the compilation of the delivery worker's map. If the carrier is delivering by map only (i.e., not using the map in conjunction with a route sheet), the street will not be delivered. There is, however, a chance that telecheck will catch the omission, but with a 2% typical verification rate, that is far from certain. If he is marking off streets on his route sheet as they are delivered, he will spot the undelivered address range and can ask around for directions.
 

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B: The second dashed red line is a road constructed very recently. As in the previous case, it will not be on the carrier's map but it will also not be on his route sheet since it may take a while for new roads to show up on USPS data products. The street will probably not be delivered. Even if the carrier physically notices the street, he has no way of knowing that the street is not on anyone else's route. Delivery verification surveys (telecheck) can not catch this type of error since they will have no postal or occupant data for the new street. Only a very observant and conscientious delivery worker would recognize the addresses as new (e.g., from new lawns, fresh asphalt, etc.) and bother to query his delivery manager. A complaint from an advertiser or publisher employee could also result in the street being delivered but the odds of that are also slim.

C: One carrier route stops (red) and another begins (blue). To avoid delivery errors, both carriers will have to pay close attention to the number ranges on their route sheets and the houses will have to be clearly marked with their house numbers. If all of these conditions are not present, there is an opportunity for one or both carriers to 1) overshoot (duplicate deliveries) or 2) undershoot (miss deliveries). This type of error is less likely if the route's address range ends at a well-marked intersection. Next