How to draw a road and show slope with different colors (QGis)?

Published: 4/10/2017
How to draw a road and show slope with different colors (QGis)?
Source: GIS.STACKEXCHANGE.COM

I found many posts here but no one was the solution for my problem. I would like to: 1.) digitalize forest roads, 2.) extract slope values from an underlying DEM, 3.) divide the roads into segments, 4.)color the segments according to their slope (see picture below. for example blue = slope 0-5%, yellow = 5-10%, violet = 15-20%, orange = 10-15%) I would like to segment the polyline with kind of "t

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