Which of the following is not something you should always do before a
journey?
a. map the road ahead
b. deflate and reinflate your tires
c. assess your fitness to drive
d. use the gps properly, if necessary

Option (B)

Explanation:

It is highly necessary to check all the equipments and the vehicle before starting a journey, specially in case of a long journey. This includes the mapping of the road, taking water bottles and other eatable things, the health condition also must be monitored, and there should be the use of GPS for the navigation purpose.

From the given options, deflation and re-inflation of tires is not something that one should always do before starting a journey.

Hence, the correct answer is option (B).