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Course 453
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Why are retaining walls built?
A drainage system is designed to remove water from the road.
What is the main purpose of fencing along rural roads?
Which material is most often used for city sidewalks?
Road markings are only for decoration.
Sidewalks are built mainly for pedestrians.
Farms along the road always use concrete fencing.
Why is reflective road marking used?
The parapet needs to be taller to meet safety codes.
What is the main advantage of precast curbs?