I am working on a road layer project. For the snapping option I'm using the mode to vertex and segment and tolerance 5 pixels. When zooming in (to the max) I do not notice a gap. But when I use the topology checker in QGIS, with the option must not have dangles I notice that there are many dangles (not only on the beginning and end point) of my poly line. Also I would really like to avoid these type of errors, instead of correcting them in the final phase. How can I avoid these kind of errors?
Currently I'm using QGIS 2.10.1