3 of the 19 documented Mexico City tourist scams sit in the transport category — the largest single cluster on the page. Reading across them, the defensive moves that recur are worth pulling out of the individual entries and stating directly.
1. Express Kidnapping (Secuestro Express). Tourists who take unlicensed taxis (libre taxis) hailed from the street are at risk of being driven to ATMs and forced at gunpoint to withdraw their daily withdrawal limit. Defensive move: never hail a taxi from the street in Mexico City. Use only authorized sitio taxis (called from a stand or phone), Uber, Cabify, or DiDi apps. Book airport taxis from the authorized TAPO or terminal taxi counters inside the terminal.
2. Express Kidnapping in Unofficial Taxis. Tourists who hail unmarked taxis (called "libre" taxis) from the street are at risk of express kidnapping, where they are taken to ATMs and forced to make withdrawals. Defensive move: never hail taxis from the street in Mexico City. Use only sitio (radio-dispatched) taxis, taxis from authorized hotel stands, or app-based services like Uber or DiDi. Book rides in advance through apps so you have a record of the driver and vehicle.
3. Overpriced Taxi from Zocalo. Taxi drivers near the Zocalo and major tourist sites charge tourists without meters or quote fares in US dollars, significantly overcharging compared to regulated rates. Defensive move: use only app-based transport (Uber, DiDi, Cabify) which shows the fare upfront and tracks the route. If you must use a taxi, agree on the exact fare in pesos before entering and confirm the driver uses the meter or accept only a written receipt.
The early-warning signals across all three: Driver solicits you from outside a taxi rank or approaches inside the terminal rather than waiting at the authorized TAPO or airport taxi counter; vehicle has no official taxi plates or illuminated roof sign; driver asks your destination before you are seated and then quotes in USD; additional individuals are present in the vehicle; Taxi is hailed from the street rather than called from a registered sitio stand. Any one of these in isolation is benign. Two together in a tourist-volume area is the cue to step back.
The pattern across the Mexico City transport cluster is consistent: most of the loss happens in the first 30 seconds of an interaction the traveller did not initiate. Slowing that interaction down — by name, in writing, before any commitment — defuses most of what is documented here.