If your vehicle is not a gray mass, then you are suspicious automatically, loud exhaust, any tuning and bigger than original wheels are stop magnet, probably somewhere in their tactics book there is mention to keep young drivers stopped often as when I was younger I got stopped often, even driving sensible way, but today I can do anything and they do ignore me, probably driving a car that partly fits in to grey mass helps and the fact that we really don't have police on our roads anymore, only few busiest places, but mostly cameras have taken over and their plan is to double those in few years or so, which means there really is no police anywhere except in larger cities and during holiday weekends on biggest roads, rest is pretty much wild west and not only because of traffic.
Driving style of course is one factor, if engine can be heard or nose dives / there is more wheelspin than movement, they like to spy and try to find something to give you ticket.
Last time I was stopped was 2007, two police man were taking a leak on rest area next to highway, I overtook some really slow 'train puller' which they probably heard more than saw, I was perfectly within legal limits all the time, but they sen message to another patrol ahead and they claimed I was stopped because of missing license plate and then apologized and told they did not see it, from their angle if they did not see 240's rear license plate, then they must be blind, true meaning of stop was to 'spook' me as here overtaking starts to be big no no, you should be go by the slowest in a line all the time.
Before that it was around 2003, I was stopped twice same day as they were taking breathe tests on two spots on my route, less than mile apart that was, between them was mostly railway bridge surely someone may take bit of power drink between those two places
1998 I think there was similar thing, but there was bit more distance between them, however I don't think those count as they did stop everyone of them and driving a brown van at very early morning is such thing that you will get tested 100% guaranteed.
When I was a teen I was stopped almost weekly and I was driving just a moped. Oddly I managed to avoid most of the attention during early years of my car driving, while all others got stopped all the time, but never had big wheels or loud exhaust pipes, also cars were boring gray mass, even my driving was not

Oh forgot the thing, there was my first own car that has loud exhaust and it did blow quite a lot of blue smoke too, however it had very rusty wheels and tiny tires, car was slow but used quite little petrol as it burned so much oil instead.
It is quite much a choices one makes that affects how much he is stopped, oh and if one manages to get on their keep one eye list, surely then you get stopped always they spot you, it is easy, have car that is gathering attention because of being loud or ugly and then get into argument with police. Had a friend once that had car which had certain sex equipment as a hood ornament among many other things and bit of an attitude so he was constantly pulled over.
Never had trouble with them really, always polite and so, but I'm not too much fan of rules which they must follow, those are made so that if you are not one of gray mass then you get attention from them, but it is here in whole society in everything one must blend or get the crap, you are free to say and think what you like as long as it is what is general opinion, that is Finnish freedom, it is not too far from Chinese freedom really.
We had snow few days ago here, very tiny bit though, something like 1mm, but was there from late evening to next day and only for next morning it was gone, it does count as first snow, I think. Western winds have been stronger this year so there has not been much of snow and cold yet, there are lot of opposing forecasts so nobody really has no idea, they just try to forecast their own opinions or affect public opinion, our official weather station put out news that it has been warmer than in 50 years, but 4 years ago it was so that people moved their lawns at beginning of December, while it has been lot of frost here already, they do it almost every year, as they claim winter will be warm and south will not get white Christmas, every year same story and even next day's weather is usually way off, so whatever they forecast I take as humorous fiction. Forecast for few days ago was -2C for then next night, reality was -7.6C, their monitoring station did read -5C as it is always bit off by night, but monthly report is often not showing that, but closer to -2C, must be some wisdom there that I'm just not able to quite understand, some correction factors perhaps.
Anyway this autumn has been much better than few previous ones, it has been hugely expensive years because of heating bills, hopefully this one will not see monthly average temps close to -20C like previous years.
tim-andre, you surely don't get much of bright part of day anymore at this time of year? Depends of course how north you live, even in here during mid day there is a lot less light than during summer, sun is not rising above trees that surround my home, so whole yard is in the shadows during the day, I don't think they see sun up north anymore, until the next spring. Because of our stupid clock adjusting scheme dark here comes earlier than during early autumn, or more appropriately early autumn dark comes late.