ok so spotted some device on the boot of a car and wondering if anyone could help my curiosity 
basically it was a small black box about the size of dvd case and twice as thick, was mounted on the top of the boot (saloon car) or the right (driver side) and pointing about 35-40 degrees off from straight back towards the drivers side. the box had a cable going from it into the boot and along the front surface had a rectangular section of different material which looked like what is used on IR sensors...you know...that glossy black plastic.
so yea... thoughts? my initial thought was a speed sensor and that it was and undercover cop car, but from my observation the driver didn't look to be in uniform, nor could I see any of the other usual signs, stuff on dash/windscreen, extra lights on front/back/in grille of the car.
my other thought is that it's a business driver and he has one of this IR detectors/jammers....
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***bit of back story***
driving down dual carriageway and people doing 45 in the over taking lane, they eventually pull over. I pull on ahead to look for a gap in the left lane for the lane i need at the round about further down the road. pass this blue BMW with the box on the back, look at my speedo and brick it a bit. was doing about 65 in a 50
mostly just slow continuous acceleration after the cars pulled in. so ease off the accelerator but still overtaking... pass him and look in mirrors, can't see uniform or other normal "undercover" things. unfortunately lots of traffic in left lane from here to junction ( and no one let me in
) so can't take first exit on round about so decide to go all the way around. the bmw was in the left lane to go left or towards motorway but half way round the round about keeps going round a bit behind me. I keep going round and come off at my exit with him now directly behind me. turn right off main road onto side road towards this golf club and stables (where i'm actually going) and he indicates too...
really bricking it now xD oncomming car also indicating and flashes me to go so now he's between me and the bmw going up the road, i turn off to the stables and look in my mirror and see the bmw pulling over at the base of the road... either stopping there or he continued on to golf club. walked down 5 mins later on the stroll and can't see him.
so not sure if cop following me or just me being paranoid of a golfer
tl : dr - dvd sized box on top of boot of BMW, what is it? I was going a bit fast, said car seemed to follow me for a short distance and take my turns then left me alone.

basically it was a small black box about the size of dvd case and twice as thick, was mounted on the top of the boot (saloon car) or the right (driver side) and pointing about 35-40 degrees off from straight back towards the drivers side. the box had a cable going from it into the boot and along the front surface had a rectangular section of different material which looked like what is used on IR sensors...you know...that glossy black plastic.
so yea... thoughts? my initial thought was a speed sensor and that it was and undercover cop car, but from my observation the driver didn't look to be in uniform, nor could I see any of the other usual signs, stuff on dash/windscreen, extra lights on front/back/in grille of the car.
my other thought is that it's a business driver and he has one of this IR detectors/jammers....
******************
***bit of back story***
driving down dual carriageway and people doing 45 in the over taking lane, they eventually pull over. I pull on ahead to look for a gap in the left lane for the lane i need at the round about further down the road. pass this blue BMW with the box on the back, look at my speedo and brick it a bit. was doing about 65 in a 50


really bricking it now xD oncomming car also indicating and flashes me to go so now he's between me and the bmw going up the road, i turn off to the stables and look in my mirror and see the bmw pulling over at the base of the road... either stopping there or he continued on to golf club. walked down 5 mins later on the stroll and can't see him.
so not sure if cop following me or just me being paranoid of a golfer

tl : dr - dvd sized box on top of boot of BMW, what is it? I was going a bit fast, said car seemed to follow me for a short distance and take my turns then left me alone.
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