in hilly areas roads are built on a small angle .why
Answers
Answer:
in hilly areas roads are built in a small angle because there is always a high chace of land slips and it will not bother someone when walking a long distance and will be helpful to reach at the top.
Answer:
To avoid dangerous travel along the steep hill roads.
Explanation:
At early times before constructing roads on hills, experts tested it by sending a donkey along a steep hill. It was seen that the donkey trailed a curve path along the steep and would not go straight up. It followed a path of grade 8% - 10%.
A powerful efficient car engine can drive straight up a steep hill but for a loaded truck, it will be very difficult to drive straight up. Thus engineers came to a conclusion that roads on the hill must be constructed with small-angle inclination to avoid extremely dangerous paths for heavy vehicles.
For a major road, the grade optimum is 8%. For minor roads, the grade can go up to 20%.
A grade and angle are two different concepts. A grade of 10% means it is an angle of 6°. The grade of 50% is 27° in angle. A grade of 100% refers to 45° angle inclination which is a too steep hill.
Therefore hilly areas are built on small angles.