MWay roadworks - why speed cam on sliproad?
Discussion
Because highways want to change perfectly unused cable central reservation to the concrete lump I'm looking at 12 month of 50mph and delays due to 3 lanes down to 2
This section does not even link up to an existing concrete CR so can't see the need. It also has a 3 foot wide v shaped gutter adjacent to main carriageway either side which(in my mind) makes it even more unnecessary)
It's been a number of weeks and no works have started yet( par for the course) but they managed to get the speed cameras out(not a surprise) straight away
Despite all the above b
ks, what's the safety reason for banging a camera on the slip road off the motorway?
I now have 50 limit on motorway and then on the slip until I hit the end of roadworks/NSL sign which is about 40 meters before the roundabout at the top
The cynic in me = revenue collection.....leave 50 controlled mway and crank up to the roundabout, no works on the slip road after all?
Is there a reason the slip needs to be reduced speed limit aswell?
Invisible workers also o the sliproad?
This section does not even link up to an existing concrete CR so can't see the need. It also has a 3 foot wide v shaped gutter adjacent to main carriageway either side which(in my mind) makes it even more unnecessary)
It's been a number of weeks and no works have started yet( par for the course) but they managed to get the speed cameras out(not a surprise) straight away
Despite all the above b
ks, what's the safety reason for banging a camera on the slip road off the motorway? I now have 50 limit on motorway and then on the slip until I hit the end of roadworks/NSL sign which is about 40 meters before the roundabout at the top
The cynic in me = revenue collection.....leave 50 controlled mway and crank up to the roundabout, no works on the slip road after all?
Is there a reason the slip needs to be reduced speed limit aswell?
Invisible workers also o the sliproad?
Patio said:
Because highways want to change perfectly unused cable central reservation to the concrete lump I'm looking at 12 month of 50mph and delays due to 3 lanes down to 2
This section does not even link up to an existing concrete CR so can't see the need. It also has a 3 foot wide v shaped gutter adjacent to main carriageway either side which(in my mind) makes it even more unnecessary)
It's been a number of weeks and no works have started yet( par for the course) but they managed to get the speed cameras out(not a surprise) straight away
Despite all the above bks, what's the safety reason for banging a camera on the slip road off the motorway?
I now have 50 limit on motorway and then on the slip until I hit the end of roadworks/NSL sign which is about 40 meters before the roundabout at the top
The cynic in me = revenue collection.....leave 50 controlled mway and crank up to the roundabout, no works on the slip road after all?
Is there a reason the slip needs to be reduced speed limit aswell?
Invisible workers also o the sliproad?
That is an average speed camera for those exiting the main route.This section does not even link up to an existing concrete CR so can't see the need. It also has a 3 foot wide v shaped gutter adjacent to main carriageway either side which(in my mind) makes it even more unnecessary)
It's been a number of weeks and no works have started yet( par for the course) but they managed to get the speed cameras out(not a surprise) straight away
Despite all the above b
ks, what's the safety reason for banging a camera on the slip road off the motorway? I now have 50 limit on motorway and then on the slip until I hit the end of roadworks/NSL sign which is about 40 meters before the roundabout at the top
The cynic in me = revenue collection.....leave 50 controlled mway and crank up to the roundabout, no works on the slip road after all?
Is there a reason the slip needs to be reduced speed limit aswell?
Invisible workers also o the sliproad?
I'm in the 2nd lane of the 2 lane slip road
The 2 lanes to my right are the remaining lanes of the m1
The 50 limit on the m1 continues un the slip to about 30 metres before the roundabout when it changes to NSL and then drops to 40 half a dozen metres before the roundabout
The camera in the pic is pointing at the sliproad
The 2 lanes to my right are the remaining lanes of the m1
The 50 limit on the m1 continues un the slip to about 30 metres before the roundabout when it changes to NSL and then drops to 40 half a dozen metres before the roundabout
The camera in the pic is pointing at the sliproad
GolfDragon said:
Is there any point in accelerating up to NSL if within a few metres the speed limit changes to 40 or is it a really long slip road that joins a dual carriageway as opposed to a roundabout.
Am I missing something here?
Not missing anythingAm I missing something here?
It's what I'm trying to understand
I presume its the decision of highways agency
I think most people's response when leaving a 50 controlled stretch of road would assume you leave the 50 behind, revert to NSL and, if safe to do so, would increase speed
Just seems like a revenue generator to me......roadworks are in cental reservation of main carriageway so no need to stick a camera on the slip off that road
Patio said:
Not missing anything
It's what I'm trying to understand
I presume its the decision of highways agency
I think most people's response when leaving a 50 controlled stretch of road would assume you leave the 50 behind, revert to NSL and, if safe to do so, would increase speed
Just seems like a revenue generator to me......roadworks are in cental reservation of main carriageway so no need to stick a camera on the slip off that road
Now I understand your question better. I’m guessing they want to measure the average speed of cars leaving the roadwork zone before you increase your speed. It probably is for the reason that people leaving at the next junction may speed up if they know they’ve gone past the last average speed camera they will encounter.It's what I'm trying to understand
I presume its the decision of highways agency
I think most people's response when leaving a 50 controlled stretch of road would assume you leave the 50 behind, revert to NSL and, if safe to do so, would increase speed
Just seems like a revenue generator to me......roadworks are in cental reservation of main carriageway so no need to stick a camera on the slip off that road
I feel like this is standard for all roadworks with average speed in the UK. In an average speed zone they always tend to stick a camera before or on the entry/exit slip roads to begin speed limit tracking as early as possible
Patio said:
Is there a reason the slip needs to be reduced speed limit aswell?
Where would you put the signage to end the temp limit for the people driving up the slip road?Then the camera is just the last camera to calculate av speed for those leaving on that slip road.
I'm not sure why it's contentious at all.
You’d be surprised what a wide angle the cameras have, where they appear to be pointing isn’t the only thing they can see.
In any case, as it’s an average speed camera it’s not like you’re going to get flashed if you hit 70 as you pass it. Not that you’ll be able to, because of the morons who don’t know what an average is slowing down because they’ve seen a camera
In any case, as it’s an average speed camera it’s not like you’re going to get flashed if you hit 70 as you pass it. Not that you’ll be able to, because of the morons who don’t know what an average is slowing down because they’ve seen a camera
Op ,
Do you understand how that camera works ?
It is not measuring the speed of car on the "slip road" , it is an average speed camera - so is reading the number plate of cars passing it, so it reference it against when the car passed a previous camera/s , which allows the average speed between camera to be calculated,
HTH
Do you understand how that camera works ?
It is not measuring the speed of car on the "slip road" , it is an average speed camera - so is reading the number plate of cars passing it, so it reference it against when the car passed a previous camera/s , which allows the average speed between camera to be calculated,
HTH
I have no idea why the OP is struggling with either issue raised.
On the placement of the camera:
An average speed system calculates speed across two distances. Obviously they need a camera at the end of the average speed section, so they can determine average speed.
If they omitted this camera, then there would both be a break in coverage for all lanes, and drivers in the left two lanes would effectively be "out" of the average speed system a mile or so back.
As sure as anything, observant drivers would choose the "last camera" point to be where they start accelerating, by removing this final camera, it would create the daft situation where the left two lanes are moving faster than the right lanes, through a section of (soon to be started) roadworks.
It doesn't take any thought at all to understand why highways people would want to avoid that, and the purpose that a final camera serves for those leaving average speed control. (All this "revenue generation" nonsense just sounds petulant).
I typically will accelerate at the last camera, but by that point you can usually see the nsl signs. I can't make out the junction, but most motorway junctions have either a traffic island or sharp bend as they join the next road. The gain in time getting up to 70 and then backing off again would typically be very slim, though I suppose it takes all sorts.
On the replacement of the barriers:
As for the second point, from a quick Google on your behalf, it appears the "perfectly adequate" cable barriers are generally considered rubbish. As a biker, I have never liked the idea of being sent into one.
Concrete barriers apparently offer far better prevention of crossing over, but absorb less energy than the Armco style ones. However concrete ones are lower maintenance, so i can see why they would be preferable.
I don't have enough information to form a view why the signage has gone up before roadworks have started. However, if I was delivering a large infrastructure project on a critical road, I would probably build in some contingency time at each stage to allow for delays or problems.
Just in time production has it's place, but I'm not sure highways contractors are up to it. Plus every bod with an orange coat and pickup in the south east is probably at the M25/A3 site this weekend, watching someone else do something.
I would add the highways people are generally quick to sign up average speed cameras as "out of use" when works are done, which makes me feel safety is their primary concern rather than revenue generation.
Losing a few minutes a day for roadworks is just part of life.
On the placement of the camera:
An average speed system calculates speed across two distances. Obviously they need a camera at the end of the average speed section, so they can determine average speed.
If they omitted this camera, then there would both be a break in coverage for all lanes, and drivers in the left two lanes would effectively be "out" of the average speed system a mile or so back.
As sure as anything, observant drivers would choose the "last camera" point to be where they start accelerating, by removing this final camera, it would create the daft situation where the left two lanes are moving faster than the right lanes, through a section of (soon to be started) roadworks.
It doesn't take any thought at all to understand why highways people would want to avoid that, and the purpose that a final camera serves for those leaving average speed control. (All this "revenue generation" nonsense just sounds petulant).
I typically will accelerate at the last camera, but by that point you can usually see the nsl signs. I can't make out the junction, but most motorway junctions have either a traffic island or sharp bend as they join the next road. The gain in time getting up to 70 and then backing off again would typically be very slim, though I suppose it takes all sorts.
On the replacement of the barriers:
As for the second point, from a quick Google on your behalf, it appears the "perfectly adequate" cable barriers are generally considered rubbish. As a biker, I have never liked the idea of being sent into one.
Concrete barriers apparently offer far better prevention of crossing over, but absorb less energy than the Armco style ones. However concrete ones are lower maintenance, so i can see why they would be preferable.
I don't have enough information to form a view why the signage has gone up before roadworks have started. However, if I was delivering a large infrastructure project on a critical road, I would probably build in some contingency time at each stage to allow for delays or problems.
Just in time production has it's place, but I'm not sure highways contractors are up to it. Plus every bod with an orange coat and pickup in the south east is probably at the M25/A3 site this weekend, watching someone else do something.
I would add the highways people are generally quick to sign up average speed cameras as "out of use" when works are done, which makes me feel safety is their primary concern rather than revenue generation.
Losing a few minutes a day for roadworks is just part of life.
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