[mkgmap-dev] Keep left/right to xxx

Hi. What are the rules when Garmin instructs to keep right/left to some_road? I know that turn left/right instruction comes if the angle between two nodes is big enough. The reason I'm asking is the situation at: http://www.openstreetmap.org/?lat=60.20587&lon=24.93416&zoom=17&layers=B000F... If I come from south via Ratapihankatu and my route takes me to east on Koskelantie, I get no instructions from the GPS unit. In this case, it would be good to get the "keep right for..." instruction. I have tried (with local file) adjusting the angle where ratapihantiesplits in to two, but only got "turn right" instruction once the angle was big enough. Just that it's not intersection requiring a turn, just a lane change...