LESSON 17 
STREET Cross-SECTIONS 
Sagas, N order to understand the problems of road im- 
gels provement it is important to have a detailed 
cS ‘Ae knowledge of road design. These details are 
A) By more numerous, more intricate and more signifi- 
Um cant than the average person supposes. The 
Niven, present study should introduce the pupil to 
some of these data, especially those which con- 
cern the plan of the public highway and the arrangement of its 
furnishings. 
Materials 
The principal studies should be made upon existing roads and 
streets in the vicinity of the school. A tape line or engineer’s chain 
will be needed to make measurements. These findings should be 
supplemented by readings suggested at the end of this lesson. 
Procedure 
Each pupil should make a detailed measurement of cross-sec- 
tions on two or three streets of different types — country roads, 
residence streets, business streets, etc. "These measurements should 
run from property line to property line and should locate precisely 
all features, such as sidewalks, trees, curbs, gutters, drains, paving, 
etc. This information should be drawn out in the form shown here- 
with (Figure 29). All sections should be drawn to the same scale 
in order to facilitate comparison. A scale of 1’ = 10’ will usually 
serve. 
After these drawings have been made for a considerable number 
70 
