[talk-au] Editing speed limit in Australia

Fri Mar 8 22:46:28 UTC 2019

| In some situations, especially on off-ramps, there isn’t any speed 
limit sign at the beginning of the link only at the end of it or in the

| middle. I observed that in these situations the speed limit of the 
motorway is added on the first part of the link. Because this is the

| predominant way of adding speed limit on links, we will map in the 
same way: if there isn’t a speed limit sign at the beginning of the link

| we will add the speed limit of the motorway and other speed limit that 
occurs along the link. If there is a speed limit sign at the beginning | 
of the link (e.g.SL60 in our example) we will add the speed limit in the 
way you mentioned (60 then 100).

What you've said is correct for off ramps but would be incorrect for on 
ramps.

The on ramp speed limit may be determined from the adjoining road(s), as 
the last speed limit sign is the applicable limit until you pass another 
sign.

So in the example given if the 60 sign was not on the link the 
applicable limit would be what it was for Warwick Road, which from 
memory is 70 near that underpass, and this would be the limit up to the 
60 sign.

So for this link it should be 70 - 60 - 100 as you go past the 60 and 
100 signs.

Cheers

Ross

On 09/03/19 02:11, Lacramioara Maghiar - (p) wrote:
>
> Thanks for your response!
>
> I got 80 from the trunk way from which the motorway link leaves.
>
> In some situations, especially on off-ramps, there isn’t any speed 
> limit sign at the beginning of the link only at the end of it or in 
> the middle. I observed that in these situations the speed limit of the 
> motorway is added on the first part of the link. Because this is the 
> predominant way of adding speed limit on links, we will map in the 
> same way: if there isn’t a speed limit sign at the beginning of the 
> link we will add the speed limit of the motorway and other speed limit 
> that occurs along the link. If there is a speed limit sign at the 
> beginning of the link (e.g.SL60 in our example) we will add the speed 
> limit in the way you mentioned (60 then 100).
>
> Best,
>
> Lacri
>
> *From:* Graeme Fitzpatrick <graemefitz1 at gmail.com>
> *Sent:* Thursday, February 28, 2019 12:19 AM
> *To:* Lacramioara Maghiar - (p) <lacramioara.maghiar at telenav.com>
> *Cc:* talk-au at openstreetmap.org
> *Subject:* Re: [talk-au] Editing speed limit in Australia
>
> Hi Lacri
>
> On Wed, 27 Feb 2019 at 21:56, Lacramioara Maghiar - (p) 
> <lacramioara.maghiar at telenav.com 
> <mailto:lacramioara.maghiar at telenav.com>> wrote:
>
>     Hi all,
>
>     I’m writing you regarding the speed limit mapping in Australia.
>
>     Specifically, how would you add the speed limit on a motorway link
>     where the speed limit sign appears in the field towards the end/in
>     the middle of the link?
>
> In Qld at least (& I think Aust-wide) speed limits officially change 
> at the sign - you may start accelerating as you pass it, not before; 
> but you must start slowing early so you're at the lower limit as you 
> pass the sign.
>
>     Please take a look at the following example:
>     https://www.openstreetmap.org/way/37282555. Here, there is a speed
>     limit sign of 100 (SL100 hereafter) in the middle of the motorway
>     link. You can see the sign here:
>     https://www.mapillary.com/app/?focus=photo&pKey=cTDOkTXf0M0gVBjem4mt9A&lat=-27.664412022684786&lng=152.7436576757009&z=17
>     <https://linkprotect.cudasvc.com/url?a=https%3a%2f%2fwww.mapillary.com%2fapp%2f%3ffocus%3dphoto%26pKey%3dcTDOkTXf0M0gVBjem4mt9A%26lat%3d-27.664412022684786%26lng%3d152.7436576757009%26z%3d17&c=E,1,Dr9tRyo_JV7aLrJTI5H8eB_cGPOQYwUzZHu7vqnOcZUHg9O7IuFsCaZZnaTALecbyZ-jbVucut0EZjGJmPSAbExe_qqJQFEGjOtx8VOC58l8myJR5XQY&typo=1>.
>
>
>     In which way would you add the speed limit information in the
>     above-mentioned case:
>
>      1. maxspeed=80 until the SL100 sign and maxspeed=100 until the
>         end of the link?
>
> I'm not sure where you got 80 from? I can only see a 60 sign at the 
> start of the link 
> https://www.mapillary.com/app/?lat=-27.663581886206885&lng=152.73979205152136&z=17&x=0.49548370263958935&y=0.50767663189853&zoom=0&pKey=B-1LcWLyCAjIQqhNjTQ7AQ 
> <https://linkprotect.cudasvc.com/url?a=https%3a%2f%2fwww.mapillary.com%2fapp%2f%3flat%3d-27.663581886206885%26lng%3d152.73979205152136%26z%3d17%26x%3d0.49548370263958935%26y%3d0.50767663189853%26zoom%3d0%26pKey%3dB-1LcWLyCAjIQqhNjTQ7AQ&c=E,1,VJy80ltGkmFEycG1wSxU0pFFSi4mqdzKkwIchqbf-uGbYO0hoK9VYP3-n_3S9-g4xBFJwAWHD2gHsrDeoWScqeT9zGXMl_oFkwA_02lw&typo=1>, 
> & speed then jumps to 100 just before merging out onto the Cunningham 
> Highway
>
>      1. maxspeed=80 represents the speed limit of the trunk way from
>         which the motorway link leaves.
>
> Welcome to Australian roads! Just because it's a trunk road, doesn't 
> necessarily mean it's got an appropriate speed limit :-(
>
>      2. nothing until the SL100 sign but maxspeed=100 starting with
>         the appearance of the sign in the field?
>
> 60, not "nothing" between the 2 signs, then 100.
>
> Hope that helps!
>
>
> Thanks
>
> Graeme
>
>
>
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