I'm currently in a project where I need to identify whether the road exist in an intersection or not. However there are 700 roads which is a hassle if I do it manually. Is it possible to identify whether the road intersects or not through QGIS commands?
Menu Processing / Toolbox / Line Intersections (see documentation) to get a new layer with points showing where lines cross (red dots in the screenshot). You can select twice the same layer as
Input and and
Intersect layer or two different layers, depending which intersections you're looking for.
Create line intersections with Geometry generator for visualization only (yellow stars in the screenshot) with this expression:
collect_geometries( array_foreach( overlay_crosses( @layer, $geometry ), intersection ( $geometry, @element ) ) )
If you want to get the intersection points of two line layers, replace
@layer in line 4 with the name of the other layer in single quotes: