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A13x
Occasional Visitor
Joined: Feb 24, 2006
Posts: 47
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 Posted: Fri Jan 11, 2008 11:04 pm Post subject: Speed Camera facing |
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how do you know which way speed cameras are facing on the google map in the database file.
I am trying to figure out which way this camera is facing
Centre Latitude: 53.45718897904939 Longitude: -2.139565944671631 |
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JockTamsonsBairn
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Joined: Jan 10, 2004
Posts: 2777
Location: Bonnie Scotland (West Central)
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| Posted: Fri Jan 11, 2008 11:11 pm Post subject: |
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Click on the camera icon & the details "TRUVELO:37321@40, Heading:270, Reversible" are displayed below the map.
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Jock
TomTom Go 940 LIVE (9.510, Europe v915.5074 on SD & 8.371, WCE v875.3613 on board) |
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A13x
Occasional Visitor
Joined: Feb 24, 2006
Posts: 47
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| Posted: Fri Jan 11, 2008 11:43 pm Post subject: |
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how do you work out which way is that?
I was stupid and went past it at 42 - 43 mph, it was a dark one so no lines on the road, they are infra red? |
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PaulB2005
Pocket GPS Moderator
Joined: Jan 04, 2006
Posts: 9323
Location: Durham, UK
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| Posted: Fri Jan 11, 2008 11:55 pm Post subject: |
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| Quote: | | how do you work out which way is that? |
0 is north, 90 points east, 180 points south and 270 points west.
There is also a compass on the page to help you.
| Quote: | | they are infra red? |
Truvelo camera is usually a front-facing camera (it can also be rear facing) taking pictures using a flash gun fitted with a magenta filter (the driver is less likely to be dazzled by the flash light)
At an indictated (i.e. according to your speedo) 42-43 mph you were probably doing more like 40-41 mph in reality.
Besides most camera don't trigger until the speed limit +10% + 2 mph - ie. on a 40 mph road they trigger at 40 + 4 + 2 = 46 mph, which would be 48-49 mph according to your speedo. |
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JockTamsonsBairn
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Joined: Jan 10, 2004
Posts: 2777
Location: Bonnie Scotland (West Central)
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| Posted: Sat Jan 12, 2008 12:03 am Post subject: |
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| JockTamsonsBairn wrote: | | Click on the camera icon & the details "TRUVELO:37321@40, Heading:270, Reversible" are displayed below the map. |
Bear in mind that the quoted direction is the direction that the traffic travels, not the way the camera faces! But given that this particular one is | JockTamsonsBairn wrote: | | Reversible |
it doesn't really matter what is shown on the map, what matters is which way the camera is facing!
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Jock
TomTom Go 940 LIVE (9.510, Europe v915.5074 on SD & 8.371, WCE v875.3613 on board)
Last edited by JockTamsonsBairn on Sat Apr 05, 2008 3:26 am; edited 1 time in total |
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PaulB2005
Pocket GPS Moderator
Joined: Jan 04, 2006
Posts: 9323
Location: Durham, UK
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| Posted: Sat Jan 12, 2008 12:08 am Post subject: |
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| Quote: | Bear in mind that the quoted direction is the direction that the traffic travels, not the way the camera faces! But given that this particular one is BGF wrote:
Reversible
it doesn't really matter what is shown on the map, what matters is which way the camera is facing! |
Good point but i understand that will be true with a GATSO which is rear facing only, but a Truvelo can be both front and rear facing so it's direction is not (so) important. |
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Andy_P
Pocket GPS Moderator
Joined: Jun 04, 2005
Posts: 19991
Location: West and Southwest London
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| Posted: Sat Jan 12, 2008 2:29 pm Post subject: |
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| PaulB2005 wrote: |
Good point but i understand that will be true with a GATSO which is rear facing only, but a Truvelo can be both front and rear facing so it's direction is not (so) important. |
Not quite with you here.
The heading information is for the direction a vehicle is heading in order to get "caught".
It is totally immaterial whether the camera itself is rear-facing or front-facing (and Truvelos can be installed front or rear facing, that doesn't mean they get turned round regularly.
The extra "reversible" tag helps for cameras (eg in the central reservation ) that are manually twisted round to face the opposite direction. Although in the past, these have been added as two individual camera positions positioned one on either carriageway for units that cannot use heading information.
MaFt, please correct me if I'm wrong with either of the above... |
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PaulB2005
Pocket GPS Moderator
Joined: Jan 04, 2006
Posts: 9323
Location: Durham, UK
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| Posted: Sat Jan 12, 2008 2:52 pm Post subject: |
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| Quote: | Not quite with you here.
The heading information is for the direction a vehicle is heading in order to get "caught".
It is totally immaterial whether the camera itself is rear-facing or front-facing. |
I understand the direction of travel etc.
I'll be honest i haven't got a clue what i was getting at except to say it made sense at the time........   Something to do with GATSO being rear facing and Truvelo being front and rear facing..... 
4 attempts to post an explanation...... |
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MaFt
Pocket GPS Staff
Joined: Aug 31, 2005
Posts: 15138
Location: Bradford, West Yorkshire
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| Posted: Mon Jan 14, 2008 2:56 am Post subject: |
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| Andy_P2002 wrote: | Although in the past, these have been added as two individual camera positions positioned one on either carriageway for units that cannot use heading information.
MaFt, please correct me if I'm wrong with either of the above... |
if it's dual carriageway then yes, if single then just 'reversible'
MaFt |
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Andy_P
Pocket GPS Moderator
Joined: Jun 04, 2005
Posts: 19991
Location: West and Southwest London
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| Posted: Mon Jan 14, 2008 2:03 pm Post subject: |
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| PaulB2005 wrote: |
I'll be honest i haven't got a clue what i was getting at except to say it made sense at the time........ |
 I have days like that too! |
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