Meeting approaching Traffic
As a general rule if the obstruction is on your side of the road oncoming vehicles have priority. As well as parked cars you may have road works, traffic calming measures, a skip etc. Any time that you continue with obstructions on your side then to do so you must not cause oncoming vehicles to change speed or direction.
Be prepared to sacrifice priority when you are not sure if oncoming drivers are going to let you through (where the obstruction is on their near side). Try not to leave it too late when deciding on your course of action so that you do not find yourself coming to a sudden stop or proceeding too fast.
Try to give a car door's clearance when passing parked cars - you should be able to do this when there are no oncoming vehicles or if the road is wide enough that oncoming traffic is not affected.
Give cyclists, motorcyclists and horse riders plenty of room when passing. Give cyclists enough room where possible so that if they fell off you would still avoid them - in particular when:
It's a windy dayThe cyclist is a young childThe cyclist is travelling up a hill
Where you have obstructions on a narrow road
Be prepared to "hang back"
If you need to stop, aim to keep a reasonable clearance from the obstruction to help maintain a good view of the road ahead, this is referred to as a "hang back" or "hold on" position. You do not want to look like you are parking up (if you are too far to the left). Move off safely as soon as clear.
M-S-M routine. Occasionally a blind spot check may be needed and you should consider a signal - applying if you think anyone will benefit.
Slow down and assess the oncoming vehicle's speed and position to help judge their intentions, be more willing to hold back for oncoming traffic as you will be able to control the situation and not rely on other people. Be more willing to give way to traffic travelling up a hill, especially larger vehicles.
Some people may flash their headlights as a sign they are willing for you to proceed. Judge their speed and position to confirm their intentions to let you through. The true meaning of flashing lightsis as "a warning of presence". So be sure of the other driver's intentions. The lights may not have been flashed for you or may have been flashed accidentally. To avoid any misunderstanding, and possible accident, do not use flashing lights to beckon people on.
Do not commit too early to pass obstructions on bends in case you have oncoming traffic.
Traffic Calming Measures
To slow the traffic down in housing areas, schools and other built up areas where otherwise traffic may go too fast. They are also located where there is only room for one vehicle to pass at a time i.e. through a narrow tunnel or over a narrow bridge.