Notice Concerning Cab Landmark Directions
A precise GPS coordinate exists for the destination. The driver has been told to look for the blue bakery past the signal.
FORENSIC ANALYSIS: CAB LANDMARK DIRECTIONS
Subject: Navigation Protocol Supplement Jurisdiction: Cities where streets are named but not always legible Status: Established
Evidence
A person is directing a cab to their home. The address is correct. The map shows the address. The driver has the app running with the same address. The person is providing additional directions.
The additional directions reference a bakery.
The map pin is accurate. This is considered insufficient.
Why the Landmark
The map can be wrong. More precisely: the map can be right about where the address is and wrong about how to approach it from the direction the cab is currently traveling. The left turn before the flyover resolves this. The flyover ramp looks like the correct approach but leads to a road running parallel to the street.
This knowledge is not on the map.
The landmark encodes it. The bakery is a reference point for the turn, not the destination. Anyone who has made the trip more than twice knows this. The bakery has been open for eleven years.
The governing rule: a local workaround may outrank the formal process when everyone already knows the workaround.
Taxonomy of Landmark Types in Active Use
| Type | Example | Function | |------|---------|----------| | Permanent institution | "SBI bank branch" | Reliable anchor | | Former institution | "where Cafe Coffee Day used to be" | Historical navigation | | Color attribute | "the blue building with the gate" | Visual disambiguation | | Relative position | "second lane after the temple" | Turn encoding |
The Inheritance Problem
The landmark has outlasted the shop it describes. The directions still work. The blue bakery is now a mobile phone accessories shop. The directions say blue bakery. Drivers who know the area understand this. Drivers who do not know the area see a mobile phone accessories shop.
Both can arrive.
Conclusion
The workaround develops timing rules, landmarks, and exceptions known only to regular users. Soon the city behaves as though the improvised protocol was planned from the beginning.
The map remains accurate. The directions remain necessary. These two facts coexist.