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I have a given table in postgreSQL with OSM data which is used for routing purposes in Java with PGRouting. There exist two columns which I don't understand. They belong to osm2po. They are labeled with "flags" and "clazz". I know, that flags describe the kind of road. It means, whether it is driveable by car, bike,... The problem now is, that I do not understand the meanings of the values in the column clazz. I just know that they also describe the road type. Can anybody explain, what the values like 12, 15, 31,... mean? Does a documentation exist where the meaning of the values is written down?

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The file osm2po.config, which can be obtained from the downloads tab on the osm2po page, contains a table with four column, defined as:

1) concurrent order

2) class (1-127)

3) default speed in kmh

4) allowed transportation type (optional) - since v4.5.30

And here are some sample rows, which I think explain where the 12, 51, etc, you are seeing comes from (in the second column).

wtr.tag.highway.motorway =       1, 11, 120, car
wtr.tag.highway.motorway_link =  1, 12, 30,  car
wtr.tag.highway.service =        1, 51, 5,   car|bike
wtr.tag.highway.living_street =  1, 63, 7,   car|bike|foot

It does say that the class can be in the range 1-127, and there are only 23 different values in that config table, so I trust that covers all the ones you are seeing?

Following comment from OP, here are the the official osm highway docs

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  • Yeah, you're right. The config file contains all possible values of classes. Each value can be assigned to a specific highway type. The descriptions of every type can be found in the OSM wiki (wiki.openstreetmap.org/wiki/DE:Key:highway). Thanks, your answer helped a lot :)
    – Bine
    Oct 9, 2014 at 13:57
  • You are welcome. I added your link to the question, but in English, as my German is a bit rusty :D
    – John Powell
    Oct 9, 2014 at 14:28
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As for the flags, I just wrote up a little explanation here. I wish I would have figured the flags out a while ago! Very useful, and a clever encoding.

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  • 1
    This link is dead. This answer is no longer useful, unfortunately.
    – scai
    May 23, 2018 at 7:04
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    Ideally add the explanation from your link to your answer. This will improve your answer and prevent having the same problem again in the future. Link-only answers are discouraged.
    – scai
    May 24, 2018 at 17:29
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From the osm2po.config file:

road type       clazz
motorway        11
motorway_link   12
trunk           13
trunk_link      14
primary         15
primary_link    16
secondary       21
secondary_link  22
tertiary        31
tertiary_link   32
residential     41
road            42
unclassified    43
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