| 6 | | The idea is to place the node aside the road (in countries with traffic on the right we place them right of the way direction they are valid for). It is useful to communicate to other mappers where you have spotted a sign, because often it is not clear where you have to split the way in order not to set a maxspeed too long on a way. This is nothing for routers of course, it is an idea to keep maxspeed more stable (otherwise the next mapper might delete you maxspeed on the whole way if he knows for a part that there is no sign, I have had this in the past). These nodes are usually tagged with traffic_sign=maxspeed, maxspeed=xy so it is clear that they are the signs. I do this for maxheight and maxweight as well (always additionally to the attributes on the way, and on the sign position with the traffic_sign tags). |
| | 6 | The idea is to place the node aside the road (in countries with traffic on the right we place them right of the way direction they are valid for). It is useful to communicate to other mappers where you have spotted a sign, because often it is not clear where you have to split the way in order not to set a maxspeed too long on a way. This is nothing for routers of course, it is an idea to keep maxspeed more stable (otherwise the next mapper might delete your maxspeed on the whole way if he knows for a part that there is no sign, I have had this in the past). These nodes are usually tagged with traffic_sign=maxspeed, maxspeed=xy so it is clear that they are the signs. I do this for maxheight and maxweight as well (always additionally to the attributes on the way, and on the sign position with the traffic_sign tags). It is also useful to mark that you checked only one direction (usually the maxspeed is valid on both directions but there is exceptions). It is also to verify in the case of repeated maxspeeds that the restriction is still valid. |
| | 7 | |
| | 8 | In Germany there is less issues with bad signs but in other countries, e.g. southern Italy, they put signs like "30" e.g. on a curve (without the curve additional sign) and then forget to release them, or there are rusty signs behind leaves and stuff like that. Have a look here for illustration: http://www.23hq.com/dieterdreist/photo/4809404 |
| | 9 | http://www.23hq.com/dieterdreist/photo/6138152? (this is a tertiary road, not a track, note the bus_stop) |
