Northwest motorway and waterview connection

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#1810992 3-Jul-2017 15:03

It will be interesting to see what google says after a few weeks. I have to go to the airport twice a month from the North Shore (usually at 4.30am ugh) so traffic isn't an issue normally but it will be oh so nice not going through Epsom.

MikeAqua

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#1811052 3-Jul-2017 16:26

RunningMan:

MikeAqua:

So if travelling through Auckland from South to North am I better to: -

Stay on SH1 all the way through Auckland; or
Or take SH20 from Manukau and then SH16 to rejoin SH1 at Wellsford; or
Or Take SH20 from Manukau, then SH16, then SH18 to rejoin SH1 at Albany?

See what Google says at the time, depending on congestion. SH1 would be the shortest and most direct, as long as it was flowing freely (which is a pretty big if!)

Will be late December so looking at google will be helpful.

Driving from Wellington to Kerikeri so I can pick my time of day to some extent.

Doing most of my driving in Nelson, I tend to forget about Google Traffic. Great tool.

Mike

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#1811081 3-Jul-2017 16:30

3-4 minutes faster for my drive to work (Mangere Bridge to Devonport) in the morning, 20 minutes from home to the esmonde road exit. The tunnel was almost empty, and the north western had what i would call moderate flow (70-80kph and all lanes reasonably full)

didn't drive that way home but did SH1/SH18 intersection to home (Mangere bridge) and i left at 255pm and hot home in 30 minutes, average speed of 78kph.

Coil

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#1811091 3-Jul-2017 16:39

How does google gather GPS data from users underground in a tunnel to report traffic?
Appears to show slower spots.

kryptonjohn

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#1811096 3-Jul-2017 16:44

Good question! Most phones these days have solid state inertial sensors so are easily able to estimate position in the absence of GPS signal, but I was not aware that they actually do that.

SATTV

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#1811104 3-Jul-2017 16:53

A mobile phone uses assisted GPS, it gets location information from cell sites and satellites.

In the absence of GPS it can also use dead reckoning which is a very good estimate ( plus the A-GPS ) to give a reasonable indication on where you are.

I dont know if there are any micro sites in the tunnel there probably ( I did not see any on the walk through ) are so this will make it more accurate.

John

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Coil

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#1811105 3-Jul-2017 16:54

kryptonjohn:

Good question! Most phones these days have solid state inertial sensors so are easily able to estimate position in the absence of GPS signal, but I was not aware that they actually do that.

But could they report speed in the case there is zero GPS signal and zero WiFi Signal?

kryptonjohn

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#1811108 3-Jul-2017 16:59

Coil:

kryptonjohn:

Good question! Most phones these days have solid state inertial sensors so are easily able to estimate position in the absence of GPS signal, but I was not aware that they actually do that.

But could they report speed in the case there is zero GPS signal and zero WiFi Signal?

Yep. The accelerometers tell about any change in speed or heading, so can be used to update position over time.

Dingbatt

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#1811147 3-Jul-2017 17:48

Interesting looking at the traffic cam at the entrance to the tunnel from the southeastern end. There is not much traffic going into the tunnel, mainly because all three lanes seem to be blocked further back by traffic using the Maoro offramp. They shouldn't be in the right most lane, but there you go.

Edit: 5.30pm in the middle of rush hours.

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sonyxperiageek

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#1811152 3-Jul-2017 17:52

Dingbatt: Interesting looking at the traffic cam at the entrance to the tunnel from the southeastern end. There is not much traffic going into the tunnel, mainly because all three lanes seem to be blocked further back by traffic using the Maoro offramp. They shouldn't be in the right most lane, but there you go.

Edit: 5.30pm in the middle of rush hours.

Do you have a link to the cam view of the entrance to the tunnel? Closest I could find is the Maioro off ramp one.

Sony

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#1812374 4-Jul-2017 09:46

sonyxperiageek:
Dingbatt: Interesting looking at the traffic cam at the entrance to the tunnel from the southeastern end. There is not much traffic going into the tunnel, mainly because all three lanes seem to be blocked further back by traffic using the Maoro offramp. They shouldn't be in the right most lane, but there you go.

Edit: 5.30pm in the middle of rush hours.

Do you have a link to the cam view of the entrance to the tunnel? Closest I could find is the Maioro off ramp one.

It's the Maoro one. But it's pretty easy to infer the tunnel traffic from it.
By the look of Google Maps maps it wouldn't have made much difference because the NW Mwy on the causeway was at a standstill at that time anyway. Interesting to me was traffic was heavier on the 'Joyce Interchange' toward the city than it was to the NWMwy.
I bet the residents on the old 'Rat Run' route will be pleased by the difference.
Now the the sightseers have done their run, can they please now stay away from my tunnel! :-)

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#1812438 4-Jul-2017 11:35

Coil:

kryptonjohn:

Good question! Most phones these days have solid state inertial sensors so are easily able to estimate position in the absence of GPS signal, but I was not aware that they actually do that.

But could they report speed in the case there is zero GPS signal and zero WiFi Signal?

How about [time exitted tunnel - time entered tunnel]/length of tunnel?

kryptonjohn

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#1812480 4-Jul-2017 11:54

But if you want the GPS to show you how far through the tunnel you are (the Mt Blanc tunnel is nearly 12km long) you need the velocity updated as you progress through. The accelerometers can tell you this by constantly updating the speed and heading with the acceleration over the last sample period and then updating the position with that speed and heading over the last sample period. As someone else said, it's a form of fine grained dead reckoning.

Linuxluver

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#1812869 4-Jul-2017 20:56

RunningMan:

tripper1000: the only thing they will be confused about is why a motorway designed and build to safely carry cars at 120 KPH has a 80 KPH limit.

Looking at the tunnel in isolation from the rest of the motorway feeding it, I can understand the limit inside the tunnel being lower. Visibility is poor compared to outside - you can't see around the bends very far, and there is no safety shoulder or stopping area to pull into for a breakdown or crash. The combination means a stopped vehicle could cause a pretty serious crash very quickly if speeds are too high for a moderately focussed driver to not be able to avoid a stationary vehicle ahead of them - look at some of the crashes you see from Europe on the motorways in fog where the speeds are higher than they should be for the visibility.

It's discouraging this needs to be explained to anyone.

Anyone who can't work this out by themselves shouldn't be allowed on the road. They can't properly assess risk and act accordingly.

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DarthKermit

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#1812883 4-Jul-2017 21:17

Going at 80 km/h through that tunnel instead of 120 km/h will cost you an extra 37 seconds of your life.

(2500 / 120000 - 2500 / 80000) * 3600

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