In general, aim to pass obstacles with at
least a metre of clearance (doors width) - more if the obstacle is alive or unpredictable!
Sometimes there will be oncoming traffic
and not enough space to for you both to pass the obstacle at the same time. In this situation, whoever has the obstacle on their side should give way.
For example, if the obstacle is on the left you should give way to oncoming traffic. If the obstacle is on the right, oncoming traffic should give way to you.
Always be aware that other road users may not do what they are supposed to. Oncoming traffic may proceed when it is not their priority, or others may wait when it is their turn to go.
If there is an obstacle on both sides of the road, nobody has priority. You will need to assess the “body language” of any other road users to establish whether they are going to wait or proceed.
Always be ready to wait for others, even if it is your priority. Make sure you check your mirrors with plenty of time to spare, signal if necessary, slow down early, and leave plenty of free space whenever possible.