wmoore wrote:
So I was on my way to work today travelling on the A48, speed limit . The road was wet due to a very light dusting of snow, which was more like slush at the time, but I got stuck behind a car doing 25-30. The problem was they kept braking all the time, which became very frustrating, made the trip to work stressful
Didn't really get a chance to overtake due to traffic and solid white lines. Lucky they turned off before I got to work.
OK so we are told to slow down in the wet, but with a road with less risks and a car with correct tread on the tyres, surely going 25-30 is too slow.
Thoughts.

wmoore
I would certain as has already been suggested - note ALL that is going on carefully in case you are missing something.
If you are satisfied that the road is tricky but suitable for a higher speed for
you and your skills and abilities, but there is nothing you feel that you can do for the moment, then relax, hang back not on their tail, as can happen if you start to become frustrated and want to urge them on, but place some calm music or chat on the stereo and take it easy, look around you more and settle back to being highly observant and ready in case any opportunity opens up (perhaps a section of clear road ahead).
There could be many reasons they are going slowly :
You have got so near to them they are uncomfortable and may have slowed deliberately or through a scare,
They have less ability or less clarity of vision, and don't see it to be as safe as you do,
They are an insurance scam and waiting for you to look in your mirror and will then slam on their brakes and you will/ maybe in their boot before you know what happened,
They are lost and trying to look for landmarks (less clear if much is snow covered),
They have had a recent emotional event take place and are simply not paying much attention,
Sick person or animal in the car ? Car fault ?
Other distracting influence -spider/fly/wasp(unlikely in winter), on the phone. got a medical problem going on - getting a migrain etc etc
ALL would tell me that they are for whatever reason a '
serious hazard' they are under-confident or otherwise occupied, and you need to stay, 'well clear, now'.
You cannot be sure precisely what is going on.
If you are feeling that you are becoming frustrated, consider the 'what if 'x' or 'y' is going on, have I tine to stop in these slippery conditions in the space that I have clear between me and them - and preferably long before I might touch their car ? Can you say yes? If not why not, what can you do to make yourself safe? Manage your risk to them - do you know how to do this?
If all seems correct - driver sitting up, paying attention, looking ahead only, no looking about or fiddling about in the car, etc then I might conclude that they are lost - esp with the regular braking. (Similar too if difficulty reading sat nav / map etc) or bad eyesight.
Was it only occupied by the driver? Driver talking to passenger/s ? Argument ?
Braking tends to be at night from night myopia, keep well back and overtake only if very safe margins are possible.
Braking during the day implies the driver is thinking of other things and is needing to brake to allow time to think during that section of road, your puzzle to manage your risk is 'why'?
What else can you tell us? Car age? Driver age? and so on and on ?
Was there any luggage, car full or a few items ? Several people in the car - were they all looking about - any look back at you several times?
Any animals in the car - that you can see?
If you have a tough boss, do you have a headset so that you can call them to notify them of you slight expected lateness.
What else can you do for yourself to stop your stress from building? Why are you getting stressed what is that about? Missing a good parking spot?