1. Click on the icon Delete 3D Signs and Markings.
2. Delete 3D view dialog box opens. Select which traffic signs you want to delete. It is possible to delete all traffic signs in the drawing, traffic signs for selected alignment, or just selected ones.
3. Repeat the same with road markings. You can select the option to delete all road markings in the drawing, or just selected ones.
4. Confirm with OK.