Design of Rural Road Segment
[pic]
Design of rural road segment.
Table of contents
1. Scope of design exercise. 3
2. Design data. 3
3. Horizontal road alignment. 3
3.1. Length of straight segments and angels of deflection. 3
3.2. Horizontal curves. 4
3.2.1. Calculation of curve length and tangent length. 4
3.3. Road chainage. 5
3.4. Determination of lane widening on curves. 5
4. Vertical road alignment. 6
4.1. Calculation of characteristic points on the road center line. 6
4.2. Calculation of characteristic values of vertical curves. 6
5. Road cross section. 7
5.1. Road layers design. 7
5.1.1. Results of computer simulation: 8
5.1.1.1. KR1(50 vehicles per hour). 8
5.1.1.2. KR3 (500 vehicles per hour). 8
5.1.1.3. KR5 (5000 vehicles per hour). 9
6. Transition curve. 10
6.1. Finding parameter A. 10
6.1.1. Geometry condition 10
6.1.2. Dynamics condition 10
6.1.3. Condition of road widening 10
6.1.4. Aesthetics condition 11
6.1.5. Condition of minimum circular curve shift. 11
6.1.6. Condition of good curve proportions. 11
6.2. Calculation of characteristic values for transition curve. 11
6.2.1. Values read down from tables. 11
6.2.2. Route shortening. 12
6.2.3. Determining of chainage of new points. 12
Scope of design exercise.
The objective of this project is to learn the detailed steps in geometric design of a rural 2-lane road of class Z.
The project exercise involves:
• designing the route in plan, including straight segments, circular and transition curves.
• designing the longitudinal profile, including tangent grades and vertical curves.
• designing the road cross-section, including pavement structural details.
Design data.
• Road design speed: 40[pic]
• Width of the bottom of drain: 0.45 m
• Vertical distance from the drainage
layer outlet to the bottom of drain: 0.70 m
•
Design of rural road segment.
Table of contents
1. Scope of design exercise. 3
2. Design data. 3
3. Horizontal road alignment. 3
3.1. Length of straight segments and angels of deflection. 3
3.2. Horizontal curves. 4
3.2.1. Calculation of curve length and tangent length. 4
3.3. Road chainage. 5
3.4. Determination of lane widening on curves. 5
4. Vertical road alignment. 6
4.1. Calculation of characteristic points on the road center line. 6
4.2. Calculation of characteristic values of vertical curves. 6
5. Road cross section. 7
5.1. Road layers design. 7
5.1.1. Results of computer simulation: 8
5.1.1.1. KR1(50 vehicles per hour). 8
5.1.1.2. KR3 (500 vehicles per hour). 8
5.1.1.3. KR5 (5000 vehicles per hour). 9
6. Transition curve. 10
6.1. Finding parameter A. 10
6.1.1. Geometry condition 10
6.1.2. Dynamics condition 10
6.1.3. Condition of road widening 10
6.1.4. Aesthetics condition 11
6.1.5. Condition of minimum circular curve shift. 11
6.1.6. Condition of good curve proportions. 11
6.2. Calculation of characteristic values for transition curve. 11
6.2.1. Values read down from tables. 11
6.2.2. Route shortening. 12
6.2.3. Determining of chainage of new points. 12
Scope of design exercise.
The objective of this project is to learn the detailed steps in geometric design of a rural 2-lane road of class Z.
The project exercise involves:
• designing the route in plan, including straight segments, circular and transition curves.
• designing the longitudinal profile, including tangent grades and vertical curves.
• designing the road cross-section, including pavement structural details.
Design data.
• Road design speed: 40[pic]
• Width of the bottom of drain: 0.45 m
• Vertical distance from the drainage
layer outlet to the bottom of drain: 0.70 m
•