WikiProject South Australia

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Due to the unclear nature of some of the definitions for highway tags much confusion has arisen as to which highways should be classified as which. This page aims to provide some definitions that will aid mappers in making this clear. Discussion about these routes occurs on the talk-au OSM mailing list.

Adelaide

Contents

Rural Areas
South Eastern
Kangaroo Island


City Areas

What exactly this covers is still being refined however south of Gawler/Two Wells, north of Aldinga/Willunga, West of Mount Barker sums it up pretty well.

Motorways

These are easy to define, there are 4:

From Glen Osmond to Murray Bridge

From Darlington to Old Noarlunga

From Port Adelaide to Mawson Lakes (stopping at the outer side of each of the bridges at each end)

Around Gawler, again starting on the out sides of the bridges.

Trunk Roads

There is currently much discussion about what constitutes a Trunk Road given the varying definitions around OSM.

The currently AGREED UPON Trunk Routes are coming soon...

Undecided Trunk/Primary Roads

The following Primary Routes are under debate for inclusion in the trunk list: (Please DO NOT change the highway tag on these highways until they are resolved)

An interesting case, All agree the section of Glen Osmond Road from Fullarton Road to the M1 should be trunk. However the other leg of the A1 in this area and Glen Osmond Road should be trunk. 

Glen Osmond Road For: IT's a main Arterial Road into the city

Glen Osmond Road Against: It carries less traffic than the Fullarton Road Leg, it's not an "A" Route, just a feeder to the city off the Trunk network.

Fullarton Road For: It's an "A" Route.

Fullarton Road Against: If you're removing "A" Routes from trunk for being insignificant this one doesn't factor that heavily as a cross-city linking route.

Argument For: It's an "A" Route

Argument Against: It's not a significant Arterial or Cross City Route

Argument For: It's an "A" Route

Argument Against: It's not a significant Arterial or Cross City Route and runs "next to" the A10

The Northern limit of trunkness is unsure due to low quality of Holbrooks Road and East Avenue. 

Argument For: It's an "A" Route

Argument Against: The roads are of low quality, and the route doesn't carry enough traffic to warrant it, even though it's a significant cross-town route.

The southern limit of trunkness is unsure to the proximity of the A13 and B23. 

Argument For: It's an "A" Route and is as busy traffic wise as the B24 (16,700 vpd vs 16,300)

Argument Against: The road isn't a heavily used as the A13/B23.

The north-western end of this trunking limit is under debate. 

Argument For: IT's an "A" Route, and Victoria Road is an Auslink Road

Argument Against: Bower Road / Causeway Road / Semaphore Road are log quality and Victoria Road is out of the way, doesn't link to anywhere.

The western end of the trunkness of this road is under debate. 

Argument For: IT's an "A" Route.

Argument Against: It's a low quality road with low amounts of traffic.

Argument For: IT's an "A" Route and carries very high levels of traffic for it's quality.

Argument Against: It's an insignificant road in the overall scheme of things and quite low quality in sections.

Primary Routes

The following routes are definitely considered to be Primary Routes:

Undecided Primary/Secondary Routes

The following routes are unsure as to whether they should be Primary or Secondary: 

Argument For: It's the continuation of a primary into the city.
Argument Against: It doesn't for a cross-city link.

Argument For: It's the continuation of a primary into the city.
Argument Against: It doesn't for a cross-city link.

The southern boundary of this is still under discussion. 

Argument For: It's a significant east-west road
Argument Against: low trafic levels, mixed quality road, too close to Beach Road

Much discussion is underway on this route.

Secondary Roads

At this point in time the only definition we have to go with is any left over multi-lane and divided roads definitely fit in this category. Another indication a road should be secondary is that it's speed limit is 60 kph (rather than the default 50kph of most back roads) Do not change any other roads down to this category at this point in time, they may still be under discussion.

Tertiary Roads

At this point in time the only definition we have to go with is and road with a centre line marked should fit in this category.

Residential Roads

All remaining roads that have a name.

Service Roads

Any small road serving an area without a name.

Rural Areas

The general Australian definition works well in this case: see Australian_Roads_Tagging.

The M/A/B rules apply well to South Australia, "C" or secondary roads can probably be defined as any remain sealed roads with line markings, and "D" or tertiary roads could be any significant linking dirt roads or non-town sealed roads without line markings.

Yahoo! Aerial imagery coverage

Adelaide Area

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