Final answer:
Maintain a steady speed and facilitate the safe overtaking of the other vehicle when you are being overtaken.
Step-by-step explanation:
When you are driving vehicle A and the driver of vehicle B is attempting to overtake, you should maintain a steady speed, keep to the right if possible and do not accelerate. It is important to allow vehicle B to pass safely.
If you are on a road where overtaking is legal and someone is overtaking you, the correct driving etiquette is to facilitate this maneuver by ensuring you do not obstruct the other vehicle. This typically means you should not increase your speed or make any erratic moves that could compromise the safety of either vehicle.