On a long journey it is advisable to rest...
A)whenever a rest area is found.
B)approximately every 2 hours.Correct
C)approximately every 5 hours.
The feeling of fatigue has a protective function for the body itself. It is like an alarm signal indicating that one's faculties have reached the limit of their possibilities and a recovery of energy is needed to drive or continue driving with the proper safety guarantees. The best remedy to recover and combat fatigue is to stop every 2 hours or 200 km maximum and rest.