Road Classification System (talk & poll)

I really didn’t understand much after reading ΦΕΚ 664B/1995 and ΦΕΚ 735Β/1995 - as I’ve said I am really not familiar with the whole road network in Greece to actually determine the importance of each road just by reading its name. I was already aware that there were 5 categories in existence, but I never found their actual definition. The above documents still don’t provide it. Thankfully, they both have a reference to ΠΔ401/1993 which provides a clear definition for each type of road in Greece.

So, if someone missed the definitions of the 5 road network categories of Greece, like I did, here they are roughly translated :

  1. Primary National Road Network (NRN) is the part of the NRN which links a) the most important urban areas with each other, b) Greece with other countries, either directly or via ports.

  2. Secondary NRN is the part of the NRN which links Primary National Roads with each other or with big urban areas, ports, airports or places of extreme tourist importance, OR they are roads which have been variated with the Primary National Road Network (= ή είναι οδικοί άξονες για τους οποίους έχει γίνει παραλλαγή με Βασικό Εθνικό Δίκτυο).

  3. Tertiary NRN is the part of NRN which have been replaced with newer roads of NRN, or serves traffic to areas with archaeological, historic, tourist or developmental interest.

  4. Primary Provincial Road Network (PRN) is the part of the PRN which links urban areas with the NRN, and also with areas of archaeological, historic, tourist or developmental interest.

  5. Secondary PRN is the part of the PRN which links Municipalities (or Κοινότητες), except the capital of a state, with each other.

Keep in mind that this ΠΔ is for the implementation of ΒΔ465/70 (something about gas stations), as it was modified by articles 2 and 3 of Ν3155/55

The roads of the Country are classified as a) National, b) Provincial and c) Municipal.

Are we still missing something? (oh, there are lots of useful info regarding their maintenance on N.3481 which also has lots of interesting data on various subjects and answers too many questions which are unfortunately unrelated to this topic).


Edit: Vote removed.

I suggest the following:

trunk - primary national roads AND roads planned to become motorways (under ΦΕΚ 253ΑΑΠ/2015)
primary - secondary national roads
secondary - tertiary national roads AND all provincial roads.

I still prefer a distinctive category for minor roads to villages and minor roads with priority: I speak from the mainland’s point of view and not remote islands, whereas not all classes of roads exist for the latter.

So, unless I am still missing something, after carefully reading the definitions of each kind of road, I think that tertiary national highways are as important as primary provincial ones (provincial roads in Cyclades are neither primary or secondary) and since I do believe that main municipal roads have some importance (i.e. tertiary), I do like this proposal far more better than other ones.

Edit: Vote removed.

After carefully reading ΠΔ401/1993 that mtraveller posted (post #31) i think that i must reconsider my voting (see also post #30 for more reasons).
Please give me some time to do so. I must also say that Amaroussi has a point. I will post my vote later.

PS @JayCBR. Can you add Amaroussi’s proposal, as proposal 4, to the poll list please? (on post #29)

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i believe the distinction between primary and secondary provincial roads is an update, based on their actual state and use in 1995, which is way better than 1956, i think is wrong for both of them to be in the same category, it would be a bad depiction of reality

i have checked regions i know about and found that:
-primary provincial roads are in good condition and actually serve traffic with very few exceptions
-the majority of secondary provincial roads are in bad condition (unpaved sections, no lines, no signs), they are broken (parts never constructed) and they serve remote villages

I am concerned about the limited range of classifications that we have on OSM. Although I try my best to try and fit it into Greece’s unique system of roads, while leaving a class for village and un-gazetted priority roads in common with many countries, we should also expand on the use of surface and smoothness. It is true however that due to the financial situation, the difference between primary and secondary provincial roads are a lot more profound. If this is the case, then what about:

motorway - motorways (under ΦΕΚ 253ΑΑΠ/2015)
trunk - primary national roads AND roads planned to become motorways (under ΦΕΚ 253ΑΑΠ/2015)
primary - secondary national roads AND primary provincial roads.
secondary - tertiary national roads AND secondary provincial roads.
tertiary - other priority roads.
unclassified or residential - every other public-access highway.

We will address how to deal with un-gazetted main roads, junction structure and bypasses later.

I really don’t know if this is feasible or not, but regardless I would like to share my thoughts with you. This is not even a proposal, because you are the ones which spent most of your time mapping these roads and I am really not familiar with the whole road network in Greece. These are just my thoughts which hopefully might help you to reach a consensus. If you like it, then do take it under consideration or propose it and/or modify it yourself as you see fit :). JayCBR please don’t include this on proposals unless someone else does so, and once again, thank you for taking the time to organize all this (sorry for another long post, I guess I should start blogging instead).


If ΦΕΚ 664B/1995 and ΦΕΚ 735Β/1995 extends ΠΔ401/1993, which was issued for the the implementation of ΒΔ 465/70 as it was modified by articles 2 and 3 of Ν3155/55, which states that «Αι οδοί της χώρας διακρίνονται σε α) Εθνικάς, β) Επαρχιακάς και γ) Δημοτικάς ή Κοινοτικάς», it seems that we basically have three different types of roads, with two of them having some sub-categories. To put it on other words, National Roads are basically our primary network (most important ones), Provincial Roads are our secondary network (less important) and Municipal Roads are our tertiary network (least important) (don’t confuse this with either OSM values for the highway key, or sub-classes of each type of road). Now, if OSM only had 3 different types of highways, then national roads would be highway=national, provincial roads would be highway=secondary and municipal roads would be highway=tertiary. Of course, motorways are clearly defined, therefore they should go to highway=motorway. Now, by definition (see wikipedia), trunk roads are “strategic roads”, therefore they are indeed the most important national roads which connect major cities. In other words, these are the primary national roads as defined by 1995 ΦΕΚs and roads planned to become motorways. This leaves highway=primary for secondary national roads AND for tertiary national roads. If tertiary national roads are in a bad shape they could also be downgraded to highway=tertiary. This leaves the highway=secondary clear for Provincial Roads. All of them. If they are indeed bad, they could also be downgraded to highway=tertiary. Again, this leaves the highway=tertiary more or less clear for Municipal Roads, which are by definition tertiary roads and priority roads ( In fact, just by checking municipal archives, almost all of the current priority roads seem to be the main municipal roads, which are already tertiary on OSM, as they can be easily be distinguished due to their importance.

In other words, how about something like…

Disclaimer: This is not a proposal but merely a thought:

motorway - motorways (under ΦΕΚ 253ΑΑΠ/2015)
trunk - primary national roads AND roads planned to become motorways (under ΦΕΚ 253ΑΑΠ/2015)
primary - secondary national roads AND tertiary national roads (tertiary national roads could be downgraded to tertiary based on their actual condition and importance).
secondary - primary provincial roads AND secondary provincial roads (secondary national roads could be downgraded to tertiary based on their actual condition and importance).
tertiary - main municipal roads and other priority roads, downgraded tertiary national roads, downgraded secondary provincial roads.
unclassified or residential - every other public-access highway

To make this easier, we could have a page on the wiki with all the national roads, their class as defined by ΦΕΚs, their relation on OSM, and their actual highway value on OSM. Later, this could be extended for provincial roads. By default, most of the roads would be on their default highway value, UNLESS, tertiary national roads or provincial roads are downgraded according to their actual conditions - and those roads should be noted on this page. You could also add a note at their OSM relation (ΦΕΚ for classification and reasons for downgrade if applicable). I think that this covers almost everything: a) JayCBR’s concern that provincial roads are less important than national roads. b) JayCBR’s concern that some provincial roads are in a bad shape, c) Amaroussi’s and my own concern that municipal and priority roads should be tertiary ones d) nikospag concern about having too many tertiary roads. This also stays true to the actual definitions of our road network based on the previously mentioned ΦΕΚs AND is helpful for routing AND follows the verifiability rules of OSM.

Now, as I said, I don’t really know if something like this is feasible or not, but at least I believe it’s somehow logical.

I ran some tests the last couple of days. I downloaded the whole Greek road network (even unclassified roads) and I tried to simulate the next 3 cases. After that, I ran some routing tests for each case. (Testing cases was only for provincial roads)

Case 1: tertiary: all provincial roads.
Result: A vast network of tertiary roads, very confusing to the eye, and even worse on islands. Many routing problems.

Case 2: secondary: primary provincial roads and tertiary: secondary provincial roads.
Result: Better looking map than case 1, less confusing to the eye. Some routing problems solved.

Case 3: secondary: all provincial roads.
Result: Good looking map, minor roads to villages were distinctive. Islands were looking very good too. Almost all routing problems solved.

To define what I mean by “routing problems” i will give just an example that caught my eye, among many others. At the map below there are 2 provincial roads. ΕΠ7 (primary provincial road) and ΕΠ30 (secondary provincial road ).

In the above cases 1&2, to go from Κεντρικό village to Δεσύλλας village, routing was going through the small tertiary road that connects these two villages directly.

In case 3, routing was going though the secondary roads. (as it should be)
Map is here http://www.openstreetmap.org/#map=14/37.2951/21.9784

So my conclusion is that all provincial roads must be tagged at least as secondary roads.
Other minor roads to villages and other priority roads must be tagged as tertiary, as they are now.
Of course secondary national roads must be tagged as primary

Please give me some time to study what we can do about tertiary national roads.
(Greek road network is really a pain in the ass :))

I also think that mtraveller’s opinion, about downgrading some roads to tertiary, must be taken into account as it adds some flexibility to the system. But keep in mind that by downgrading roads, routing problems can emerge easily. Anyway, we can discuss about exceptions later.

PS. I think that voting system is too confusing. (or is just me?).

The voting system is too confusing.

There has to be a special reason for downgrading classified roads below the minimum (e.g. cars banned in Hydra). Just because it is single lane does not justify downgrade if it is good quality.

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Poll 1: Conditional A+B Specifically, any major or motorway-like priority roads between other primary national roads, such as the old A65 in Athens. The importance of a network is essential.

Poll 2: B. Too many tertiary roads will cause confusion.

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just vote already, to see where we stand

i don’t think others will come (i invited at least 8 people to join the conversation, but i dont see them)

it’s not so difficult for 4 people to reach an agreement

i think we have to remove replies to the old polls to avoid confusion

EDIT1: i updated the list of national highways in the wiki:
http://wiki.openstreetmap.org/wiki/WikiProject_Greece/Highways

as i noticed the tertiary national network comprises mostly by old or minor national highways that are rather insignificant…so i think they could be in the same category as primary provincial

as i understand highway=tertiary causes problems to the routing, so we better not use it for any national or primary provincial roads

Yes it’s difficult for 4 people to reach an agreement. And because you did not posted a clearer voting system, i’m sorry that i will post my own.
EDIT: And i can’t find my choice in any of your voting systems

Trunk (1)=
a) primary national network
f) roads planned to become motorways defined in ΦΕΚ 253ΑΑΠ/2015
g) motorway-like roads

Primary(2)=
b) secondary national network
c) tertiary national network
d) primary provincial network

Secondary(3)=
c) tertiary national network
d) primary provincial network
e) secondary provincial network

Tertiary(4)=
d) primary provincial network
e) secondary provincial network
o) none of the above (just minor roads)

Voting must be like this (for example):
1=a+f or 1=a etc
2=b+c
3=d+e
4=o
each letter (a,b,c,d,e) is a unique network, other letters are complementary
note that the letter(s) of your choice can’t be in more than one categories

my proposal is this:
trunk - primary national network + motorway-like roads + roads planned to become motorways
primary - secondary national network
secondary - tertiary national network + primary provincial
tertiary - secondary provincial + roads connecting villages

So JayCBR voted:

1=a+f+g
2=b
3=c+d
4=e

1=a+f
2=b+d
3=c+e
4=o