  Navigation applications are becoming ubiquitous in our daily navigation
experiences. With the intention to circumnavigate congested roads, their route
guidance always follows the basic assumption that drivers always want the
fastest route. However, it is unclear how their recommendations are followed
and what factors affect their adoption. We present the results of a
semi-structured qualitative study with 17 drivers, mostly from the Philippines
and Japan. We recorded their daily commutes and occasional trips, and inquired
into their navigation practices, route choices and on-the-fly decision-making.
We found that while drivers choose a recommended route in urgent situations,
many still preferred to follow familiar routes. Drivers deviated because of a
recommendation's use of unfamiliar roads, lack of local context, perceived
driving unsuitability, and inconsistencies with realized navigation
experiences. Our findings and implications emphasize their personalization
needs, and how the right amount of algorithmic sophistication can encourage
behavioral adaptation.
