Telenav/Integrity Checks

Description

Telenav uses OSM Data Integrity Checks to continually monitor OSM data. They are mainly focused on potential issues that would impact the road network and tags that affect automotive navigation applications.

We publish the current results of our Integrity Checks to MapRoulette when it makes sense.

What these checkers detect are not always necessarily errors! We look at each result manually and determine if something needs to be fixed.

For more information reach out to user:mvexel

Integrity checkers

No	Integrity Check	Checks for....	Detailed rules	Remarks / Examples
1	Conditional turn restrictions	correct formatting of Conditional restrictions tagging	A conditional turn restriction should look like this: no_right_turn @ (Mo-Fr 10:00-12:00;Sa-Su 15:00-19:00)
2	Unexpected key-value combinations	non-conforming combinations of key-values in Key:barrier, Key:oneway and Key:access
3	Turn Lanes Order	Searches if the order of the values in Turn lane are correct	reverse, sharp_left|slight_left|left, merge_right - should be on the left side of the road and in the specified order right, right|slight_right|sharp_right, merge_left - should be on the right side of the road and in the specified order in between those mentioned above should be the following values:  |through| or |none|
4	Named Roundabouts	Roundabouts that have names.		This is not necessarily an error, but it is uncommon and needs double checking.
5	Reverse Roundabouts	Roundabouts that go against the flow of traffic
6	Invalid Turn Restriction	non-conforming tags in Turn restriction relation	missing "from" way missing "to" way less than 3 members already restricted by oneway
7	Named Links	link ways that have Names		Not always an error but often points to information that should be in Key:destination tags.
8	Ramp Classification	link ramps with incorrect values for the road category ("highway" tag). The road category information should be taken from the highest functional class of the roads it connects to	Link roads between different highways types
9	Lane Counts	lanes tags with values that don't add up	tags should hold positive integer values number of lanes on each direction of flow (forward, backward, both ways) must add up to the total number of lanes if turn:lanes is present, then the number of turn:lanes should be equal to the number of lanes
10	Route Nodes	Relation:route that have nodes as a member
11	Pierced Tunnels and Bridges	ways that are Tunnel or bridge that connect to non-tunnels and non-bridges somewhere in the middle	A ground floor road and an underground road can intersect each other in 2D view but not in 3D view
12	Suspicious Layer Transitions	consecutive ways that have conflicting Layer values
13	Destination Conflicts	consecutive link ways that have different key:destination tags		See this image on OpenStreetCam This is okay if there is a branch, as pictured above, but probably an error if there no branch.
14	Bad Highway Tags	very unusual tags on Key:highway ways
15	Self-Intersecting Ways	ways that intersect with themselves and does not have a common node at that intersection
16F	Oneway Loops	loops that cannot be exited	in most cases the road driving to/from these loops are oneways, but that information is incorrect or the direction should be reversed
17	Misnamed Double Digitized Ways	double digitized ways that don't have the same name for each of the directions
18	Cardinal Directions	relations that have incomplete and / or incorrect cardinal direction tagging		This applies only to countries that use cardinal directions as part of their numbered highways. See on OpenStreetCam
19	Unexpected Dead Ends	higher class roads that end abruptly or switches into another road class without apparent reason	Roads that end with a tag of noexit=yes, highway=turning_loop, highway=turning_circle, highway=construction, highway=proposed should not be detected	Not always a mistake but unusual and should be looked at.
20	Bad Ramps	_link ways that are two-way streets, or are connected to the road network at an invalid angle	Interpretation of error messages: No reasonable turn to ramp = the angle to turn from a way to ramp is unreasonable No reasonable turn from ramp = the angle to turn from a ramp to way is unreasonable Two-way ramp connected to one-way ramp = ramp doesn't have a oneway tag
21	Smoothness	crudely mapped ways by checking for shapepoint angles of more than x degrees.	The cases detected do not have such sharp angles and do not affect navigation but it would be an improvement in displaying
22	Typos	slight name differences between connected ways	Maybe they need to be the same, orit is just a spelling mistake
23	Bad Words	names that contain words from http://www.noswearing.com/dictionary	Compares parts of street names (the name tag) against a blacklist of inappropriate terms. This checker searches only for words in English
24	Misnamed Roads	ways with names that have no common suffix	Based on rules governing how display names are constructed, expose the roads that would appear as ‘unnamed’ or are not complete (meaning without sufix/prefix)
25	Bad Tag Values	name tag contains invalid characters such as: ";" "," "|"	The checker looks for invalid values for name, access, barrier and oneway tag – (ex. name tag contains invalid characters such as: ";" "," ")"
26	Road Network Islands	islands in the road network that cannot be entered or exited	basically a group of streets that cannot be accessed because there is no connectivity
27	Crossing Ways	ways that cross without having an intersecting node and without being tagged as bridge / tunnel
28	Dead End Ramps	ramps (*_link) that are only connected at one end	Ramp edges that are only connected at one end (regardless of distance)
29	Zorro Ways	ways that have very sharp angles	Aangle threshold can vary by road class. This kind of cases can affect navigation and routing
30	Motorway Tag Flip Flops	motorway and motorway_links belonging to the same route (by route relation or name) that are connected with a lower class road
31	Overlapping Ways	segments of highway that are one on top of the other
32	Single-Dual Flip Flops	ways that flip-flop between single and dual carriageway mapping within a short distance	Integrity Check to detect ways that flip-flop between single and double digitized ways based on the ratio between them and the distance from an intersection to another
33	Impossible One Ways	one-way segments that cannot be entered or exited	An Integrity Checker that detects impossible one-way situations (nodes with no entry or exit possible), many of the cases reflect an editing error where the direction of flow is reversed
34	Unconnected Ways	ways that end very close to other ways	Integrity Check that detects roads that end too close to other roads, usually this is an editing error and the roads should have been connected through a common node.
35	Duplicate Nodes	duplicate nodes (same location) in ways		Ex. Detects ways that have four nodes and two of them are overlapping
36	Oneway Flip Flops	consecutive ways that switch between Key:oneway yes/no
37	Signposts	motorway_link or trunk_link off-ramps and Junctions that do not have all the tags in place for proper navigation guidance	If the node has the tag "highway=motorway_junction", then the node must also have one of the tags Key:ref, Key:noref; it highlights also the nodes that have the deprecated tag Key:exit to If the way has any of the tags Key:destination, destination:street, destination:ref, destination:ref:to, then the node must have the tag highway=motorway_junction and one of the tags ref, noref	This checker has been dropped off
38	Name and Ref Flip Flops	segments of a road that have different tag values from the rest of the road	Possible name tag inconsistency - a small segment that belongs to a specific road has a different name tag from the rest of the road Possible ref tag inconsistency - a small segment that belongs to a specific road has a different ref tag from the rest of the road
39	Highway Tag Flip Flops	segments of a road that have different Key:highway tag values from the rest of the road	Possible highway tag inconsistency - a small segment that belongs to a specific road has a different highway tag from the rest of the road
40	Maxspeed flip-flops	Segments of a road that have different tag values than the road is belonging to.	Possible maxspeed tag inconsistency - a small segment that belongs to a specific road has a different maxspeed:forward or maxspeed:backward tag from the rest of the road