It happens only when they stop their car at a taco or banh mi truck.

Banh mi sandwiches, like these in Nhatrang, feature French baguettes filled with a tasty variety of meats and vegetables.

The fully loaded banh mi comprises French bread stuffed with pate, pork, chicken, pickled carrot, daikon, cucumber and cilantro, topped with a Fried egg, hot sauce and mayonnaise.