help solve these Name of Student April 26, 2013 0 inal Problem 6. 20 points) Ans

Question

help solve these

Name of Student April 26, 2013 0 inal Problem 6. 20 points) Answer the following questions 1) Why does the typical cross section of a tan April 26, 2018, 2:00-40PM gent pavement take a crown shape? 2) Name the 3 layers of a typical asphalt pavement structure. Describe the possible damaging effects of water to a pavement structure. 3) What are the major functions of a guard rail facility? Where do you see the facility often? 4) What is a tangent runout? What is the purpose to include a tangent runout? 5) What are design controls for roadway geometric design? Name three design controls.

Explanation / Answer

(1) Answer:- For drainage purpose cross section of tangent pavement take a crown shape.

(2) Answer:- Layers of asphalt pavement structure:-

(i) Sub grade layer

(ii) Aggregate base layer

(iii)Asphalt pavement base layer

Water reduces strength of pavement. Water damages surface of pavement structure.

(3) Answer:- Functions of gaurd rail:-

(i) The gaurd rail face

(ii) The end terminal

It see alongside road.

(4) Answer:- Tangent runout is very useful in road. Tangent runout is the distance needed to change from a normal crown section to a point where the adverse cross slope of the outside lane or lanes is removed.

(5) Answer:- Basic design controls are foundation for establishing the physical , safety and functionality of the transportation facility..

Name of basic design controls:-

(i) Roadway context

(ii) Roadway users

(iii) Transportation demand

(iv) Measures of effectiveness

(v) Speed

(vi) Sight distance

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