What distance shall we keep from this vehicle ahead of us?

A)At least 50 meters.
B)A distance sufficient to allow us to stop without colliding with that vehicle.Correct
C)A distance sufficient to allow us to stop without colliding with that vehicle and at the same time allowing us to be overtaken.
When traveling behind another vehicle, you must leave a space that allows you to stop, in case of sudden braking, without colliding with it, taking into account the speed and the conditions of grip and braking. In addition, if you are driving without signaling your intention to overtake, this separation must allow the one following you to overtake safely.
For these purposes, drivers of vehicles with more than 3,500 kg MAM and vehicles and combinations of vehicles longer than 10 meters, will keep a minimum separation of 50 meters.
It will be sufficient to maintain a distance to avoid collision (not necessary to keep distance for them to overtake us):
- In built-up areas.
- Where overtaking is prohibited.
- Where there is more than one lane in the same direction.
- When traffic is saturated.
- When you intend to overtake.
In the case of the image, since overtaking is prohibited, it will only be necessary to maintain the safety distance, that is, the distance that allows us to brake and stop without colliding with the vehicle ahead.
For these purposes, drivers of vehicles with more than 3,500 kg MAM and vehicles and combinations of vehicles longer than 10 meters, will keep a minimum separation of 50 meters.
It will be sufficient to maintain a distance to avoid collision (not necessary to keep distance for them to overtake us):
- In built-up areas.
- Where overtaking is prohibited.
- Where there is more than one lane in the same direction.
- When traffic is saturated.
- When you intend to overtake.
In the case of the image, since overtaking is prohibited, it will only be necessary to maintain the safety distance, that is, the distance that allows us to brake and stop without colliding with the vehicle ahead.