To think I had every right to be in the right hand lane when driving the speed limit on a dual carriage way

Agreed and thos that don't believe you was in the wrong need to retake their driving test, IMO

All those saying the outside lane is for overtaking only and you should be in the left lane until the last possible moment.

Can I assume when you approach a junction where the left hand lane is for turning left only and doesn’t say so until the last possible moment, can i assume if you are at the junction and in the right hand lane in order to go straight ahead or turn right. You will automatically let the left hand lane cars who want to go in your direction go infront of you as they are doing exactly what you said they should do

OP there is no talking to you .
You are obsessing over the other driver focus on you doing the right thing (you weren’t)
it’s not your job to police other drivers .
You were wrong accept it

I think you need some refresher driving lessons tbh .

PP has used maths to prove the OP's statements around distance to the junction incorrect. There was no need for the OP to be hogging the right lane and blocking others from overtaking. The other driver speeding is irrelevant and absolutely nothing to do with the OP. You don't get to police other drivers.

If the other driver had the time to undertake and pull back in, you had time to do the same.

OP, you should have moved over to let the speeding driver past. Your DH was correct and the majority here agree that you are incorrect. Take it as a lesson and hopefully this will help you to be more situationally aware when driving.

Overtaking and being directed into that lane.

The outside is for over taking then you move back to the left .

It NOT your job to decide what speed people do and the police will tell you this. You watch other road users and you make sure you are driving correctly . What you don’t get to do is hold back traffic .
Have you read the signs “frustration kills” It’s exactly for the people who drive like yourself .

Actually even if it is to get away from a lorry changing lanes it is an offence to speed.

I'm not sure that is actually the bar for a safe manoeuvre. Other drivers may have had to take evasive action, I know I have done so when silly cars have pulled stunts like this.

Nothing major happening is not the standard of a safe manoeuvre

I know a road system exactly like this - leaving the A1 to join the very bottom of the M1. You need to be in the right lane of three to join the M1.

You do need to get over in good time to avoid crossing multiple lanes of busy traffic. Everyone who knows the road, does this. They get over to the right lane with around a mile to go.

I understand OP and think you did the right thing, unless the whole rest of the road was clear, which would have enabled you to join the right lane at the last minute.

Something tells me that if he had hit another car or caused an accident OP would have said so.

No they don't.

Wrong. People like you cause accidents.

It OP did t mention amongst all the detail that it was unsafe?

You'd have thought she would.

Yet the car behind you managed to get into that lane safely and back into yours

We have no idea how safely that other driver managed to do this. Given the manner of his driving until that point I wouldn't be certain enough to state that he did it safely.

Yet the car behind you managed to get into that lane safely and back into yours, despite the fact that when he started the manoeuvre he can't have been going any faster than you.

Yes you do need to adhere to the speed limit, but it's not up to you to control others.

If they want to drive like w#nkers it's up to them to deal with the risk. If you aren't overtaking you stay in the left lane.

On OP's own description of events, she had more than enough time to move over, particularly if she was checking her mirror properly so that she could have started moving when she saw the car behind approaching.

Ah, another AIBU where the OP just wants validation, doesn't get it and just keeps insisting she's right. YOU ARE WRONG OP. ACCEPT IT AND MOVE ON. I see women driving like you on motorways every fucking day and the INDEFENSIBLE driving of these women makes me ashamed to be a woman.

The highway code says Use the right lane for overtaking or turning right.

Most motorway junctions have a one mile and half mile advance direction sign. This is to give drivers time to get in the correct lane. Once you've passed a sign showing lane 2 for your slip road or whatever you are fine to use that lane.

So what? How does that affect your decision at the point when you were refusing to move over?

How can it be everyone's job to control the speed limit, especially on a dual carriageway or motorway?

It most emphatically is not everyone's job to control it by ignoring other important safety rules under the Highway Code.

YABU for not giving us enough information and DH is BU for judging you without that information (or was he with you at the time?).

There are two possible extreme scenarios and a range of scenarios in-between.

One. Both lanes are full of fast-moving traffic, most, but not all, of which are already in the lane they need for the imminent lane divergence, and everyone needs to be on the lookout for dozy last-minute lane-changers. Because the two lanes are going to different destinations, the normal speed differential between lanes may have begun to break down.

In scenario one, I would sit tight.

Two. The road is empty as far as the eye can see. Nor am I yet on top of the lane divergence. I would pull over to allow passing.

What was your scenario @P3kingDuck ?

They’re pretty much a last warning. And tend to only be when exiting a slip road rather than a lane split on a du carriageway.

Given the marker signs start at 300 metres……. You know, 3-2-1.