modeling pavement from a projection

[mikelegnr]

hello to all boys are new here, I need help with modeling a pavement of a park on a ground. starting from the projection of the plant of the path. what I need is that the road must have a development with a parallel section on the floor, that is that it is not a tilted section . I attach the image of the projection

 

[Sibillo]

Draw the section of the curb then sweep carefully on the sweep options that the twist is selected to have the untilted plane.