Average speed camera help please

poppasmurf_bewdley

kenneth77 wrote: »

Just driving down the motorway and some roadworks start which I forgot about, the weather was bad and never noticed the sign. I went through the first average speed camera I think I was probably speeding at the time. I then left the motorway immediately after the first one where it goes back to national speed limit, the roadworks continue on the motorway I have left. As only going through one camera am I still likely to be in trouble?

Thanks

You forgot about the roadworks and never noticed the sign.

What were you doing whilst in the drivers seat? :eek:

Spicy_McHaggis

Richard53 wrote: »

Haha, fencepost error. Nice example.


http://en.wikipedia.org/wiki/Off-by-one_error

Is it?

Your reference says its 7.

Waspo

poppasmurf_bewdley wrote: »

You forgot about the roadworks and never noticed the sign.

What were you doing whilst in the drivers seat? :eek:

Well M'luard i was on the phone and searching for my whiskey bottle at the time i passed the signs, so i's just did not see it...Honest Guv!! :rotfl:

facade

Richard53 wrote: »

Haha, fencepost error. Nice example.


http://en.wikipedia.org/wiki/Off-by-one_error

Agree with Spicy, 8 cameras = 7 spaces, no error.

Unless "pairs" could mean 1-2, 1-3,1-4 and so on, then there are 28 pairs

Although enforcing 1-8 as a single pair would be pointless, as you can't exceed the average over the whole distance without being over on at least 1 of the segments.

agrinnall

Richard53 wrote: »

Haha, fencepost error. Nice example.


http://en.wikipedia.org/wiki/Off-by-one_error

Spicy_McHaggis wrote: »

Is it?

Your reference says its 7.

facade wrote: »

Agree with Spicy, 8 cameras = 7 spaces, no error.

Unless "pairs" could mean 1-2, 1-3,1-4 and so on, then there are 28 pairs

Although enforcing 1-8 as a single pair would be pointless, as you can't exceed the average over the whole distance without being over on at least 1 of the segments.

I wasn't sure whether Richard was agreeing with me or trying to suggest that I'd made an error, but I'm glad to see spicy and facade have backed up my post.

forgotmyname

Those signs up on the m54 are a mess. Last time i went that way i joined the M54 off the M6. 50mph signs, Then shortly after that there was a national speed limit sign, so i sped up again, then they had 50mph repeater signs.

I was waiting for a ticket to arrive but one never did.

Richard53

agrinnall wrote: »

I wasn't sure whether Richard was agreeing with me or trying to suggest that I'd made an error, but I'm glad to see spicy and facade have backed up my post.

Oops, trying to be brief and ended up being unclear. Yes, I was agreeing with you. You were answering Paradigm's question of why it would be 7 instead of 8, and what you identified was a nice clear example of a fencepost error.


Sorry for the confusion.

Spicy_McHaggis

Richard53 wrote: »

Oops, trying to be brief and ended up being unclear. Yes, I was agreeing with you. You were answering Paradigm's question of why it would be 7 instead of 8, and what you identified was a nice clear example of a fencepost error.


Sorry for the confusion.

Did he think it was 8?

IamNotAllowedToUseMyName

Just to be clear, you can drive through one camera as fast as you like, they do not measure speed, they simply read your number plate and take a time at a point on the road. They will then do the same at the next camera and work out the time difference and the distance traveled.

Then there is ACPO tolerance of 10% + 1mph, ie you can do 56mph without being done. Add in speedometer error, of you were doing 70 you were probably doing a real 67, so if you then slowed to 50, really 47 say, you've got quite a chance of averaging under the limit, but only if you reacted in roughly 25% of the distance between cameras.

That also explains why some people aren't convinced that average speed cameras work when they go through at what they think is about 60.

Spicy_McHaggis

IanMSpencer wrote: »

Just to be clear, you can drive through one camera as fast as you like, they do not measure speed, they simply read your number plate and take a time at a point on the road. They will then do the same at the next camera and work out the time difference and the distance traveled.

Then there is ACPO tolerance of 10% + 1mph, ie you can do 56mph without being done. Add in speedometer error, of you were doing 70 you were probably doing a real 67, so if you then slowed to 50, really 47 say, you've got quite a chance of averaging under the limit, but only if you reacted in roughly 25% of the distance between cameras.

That also explains why some people aren't convinced that average speed cameras work when they go through at what they think is about 60.

If they decide to go along with that.;)