Speed Camera Vans.. information please.

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WildMan10
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Re: Speed Camera Vans.. information please.

Post by WildMan10 »

warpc0il wrote:
Sat Feb 10, 2018 7:07 pm
Uncalibrated, the devices high on a bridge would read slightly fast
I disagree. They will read slow, recording the component of the velocity vector along the line of sight (velocity x cosine of subtended angle).

Take the extreme example of the car underneath the bridge. The gun faces straight down and measures 0 mph towards it, which is reading low.
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Re: Speed Camera Vans.. information please.

Post by PeteH »

Yep. Ian's right.

It would be interesting to know if the spacing between the calibration lines changes slightly as the subtended angle is changing.....
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Re: Speed Camera Vans.. information please.

Post by warpc0il »

This is getting weird as I'd original written "Uncalibrated, the devices high on a bridge would read slightly slow" as that's what my gut told me.

I then got that crazy Greek in my head and the maths said that the hypotenuse was longer, so to get there in the same time, you'd have to be going faster.

Of course, while the speed gun is looking along the hypotenuse, you're still travelling along the base...

Gut 1 - Head 0
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Re: Speed Camera Vans.. information please.

Post by Rotary Potato »

warpc0il wrote:
Wed Feb 14, 2018 1:23 pm
...

I then got that crazy Greek in my head and ...
It could have been worse.

You could have had the other crazy Greek in your head and come out with all sorts of politically incorrect nonsense! :lol:

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Re: Speed Camera Vans.. information please.

Post by WildMan10 »

The DoE may be politically incorrect but he doesn't talk nonsense. He doesn't suffer fools gladly, that is true, but his views are always sensible and the vast majority of his 'gaffes' are manufactured by the media's taking his comments out of context.
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Re: Speed Camera Vans.. information please.

Post by geofftl1000r »

I asked a friendly police officer how the speed on his GPS compared to the speed on his calibrated speedo and he said it seemed to read 3mph faster at all speeds. So it seems the GPS was very accurate but was set to error 3mph faster to help protect the unwary motorist.
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Re: Speed Camera Vans.. information please.

Post by warpc0il »

I wonder what "GPS" he was using.
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Re: Speed Camera Vans.. information please.

Post by wiggles »

I got caught by one the other day first ever speeding ticket... d'oh

Dual carriageway goes from 70 to 50 for no reason that no-one ever pays attention to... Luckily I was in Beth's golf so got caught at 60 rather than the speed I would be doing in my car lol
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Re: Speed Camera Vans.. information please.

Post by bigpete8 »

Anybody tried the Tom Tom Speed camera app?
Just put it on phone I'll feed back in a few days...
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Re: Speed Camera Vans.. information please.

Post by Dr. FrankenRex »

Google maps now includes speed cameras, FYI... This is free...

Also, it's an unpopular opinion to have, but if you don't wanna get caught speeding - don't speed. Simples
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Re: Speed Camera Vans.. information please.

Post by bigpete8 »

Tom Tom app is free also...

Totally agree but everyone has done it whether intentionally or not.
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Re: Speed Camera Vans.. information please.

Post by Dr. FrankenRex »

Not saying I haven't, and I've been caught doing so, but still :)
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Re: Speed Camera Vans.. information please.

Post by ChrisHolmes »

bigpete8 wrote:
Wed Feb 13, 2019 10:15 am
Anybody tried the Tom Tom Speed camera app?
Just put it on phone I'll feed back in a few days...
Yes, I use the TomTom GO app on my iPhone and it is excellent for fixed cameras but patchy for mobile units. A very useful feature is the average speed indicator for road works on motorways and the GPS speed reading too.
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Re: Speed Camera Vans.. information please.

Post by ChrisHolmes »

bigpete8 wrote:
Wed Feb 13, 2019 10:43 am
Tom Tom app is free also...

Totally agree but everyone has done it whether intentionally or not.
FREE! I paid for a 3 year subscription for TomTom Go! Are you referring to the feature on an actual TomTom device?
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Re: Speed Camera Vans.. information please.

Post by Azimuth »

There is a great (Free!) Sat Nav app on Android & iOS called "Waze" that allows its users to report speed traps and police vans etc... Of course, this is reliant on at least one user making a report, and them being accurate, so it couldn't be relied upon for every trap or in rural locations, but in busy areas, like A roads and large towns it is VERY handy, as the updates are basically real time.
Highly recommended, as the more users the better.
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Re: Speed Camera Vans.. information please.

Post by bigpete8 »

ChrisHolmes wrote:
Wed Feb 13, 2019 7:04 pm
bigpete8 wrote:
Wed Feb 13, 2019 10:43 am
Tom Tom app is free also...

Totally agree but everyone has done it whether intentionally or not.
FREE! I paid for a 3 year subscription for TomTom Go! Are you referring to the feature on an actual TomTom device?
App is free on android at least...
Usual will use your "anonomised" data...
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Re: Speed Camera Vans.. information please.

Post by geofftl1000r »

warpc0il wrote:
Tue Feb 12, 2019 10:33 pm
I wonder what "GPS" he was using.
Sorry never asked.
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