I have a shapelayer with lines (streets), each line has a value for the traffic on it. The value is shown by the width of each line. Now I want to smooth the transition between one segment that has e.g. the value 500 which goes into a segment with value 100. Any ideas? I want to achieve more or less the same result, as in this post, only automatically for a larger dataset … Blend differing line thicknesses in QGIS?
This is not a complete solution, but it may provide a starting point that you can improve on.
The startwidth of each line feature should be the same as the endwidth of the line it connects to.
In my test example, I filled in the values for startwidth and endwidth manually. The next question would be how to automate these values.