Mr. Dazzle wrote: ↑Sun Jun 18, 2023 8:39 pm This is another one of those weirdy beardy codifying the obvious things innit?
Yes.
Speaking as a beardy well renowned for this sort of claptrap, I can assure you that it is totally to bamboozle the uninitiated
There might be a slight underlying reason for such invented terms.
As T says, there are essentially two types of overtaking manoeuvre:
1. You're travelling substantially faster than the other vehicle. You pull out, pass it. No speed change required.
2. You have to follow at the same speed, then pass when there is an opportunity. Acceleration required.
'1' is known as a 'momentum' overtake
'2' is the occasion for the 'three stage'
Being awkward, I call them either 'S' (1) or 'Z' (2) to describe your path of travel through the approach. Use your imagination
Also, for '2', I have used a series of prompts, to be applied through the three stages: Gear-Clear?-Go
1. Preparation, select a responsive gear
2. Move out, check before committing to passing
3. If ok, accelerate
FWIW, someone made up a spreadsheet and worked out that, for a momentum overtake, you have to commit earlier.
Edit: just remembered, there's the 'elastic band' technique too. Typically either low-power vehicle, or when you know a potential passing point has limited space. This is where you are following, but start to accelerate before pulling out to check it's really a good idea to pass. Obvious implications if it's not ok to pass and you're accelerating towards the vehicle ahead ...