datero
An informal worker stationed at bus stops who tracks the time intervals between buses on the same route. They sell this information to drivers so they know how far ahead their competition is and whether they need to speed up. (In Peru, they are part of the informal public transport system and are usually paid a small coin for the data).
I heard the datero give him some info and the driver started driving like a maniac.
Automatically translated from Spanish
Perú