12. Cross sectional elements
Cross-sectional elements are integral to pavement design, influencing the safety, comfort, and longevity of roadways. Key characteristics such as pavement surface attributes, camber, and drainage play a critical role in ensuring effective road performance. The chapter outlines essential design parameters, including friction factors, unevenness indices, and specifications for road margins, which all contribute to efficient traffic movement.
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What we have learnt
- Pavement surface characteristics, such as friction, unevenness, light reflection, and drainage, are crucial for road safety and comfort.
- Camber is significant for effective drainage and surface protection, with specific IRC values recommended based on road type.
- The design of cross-sectional elements, including carriageway width, kerbs, and road margins, is essential for accommodating vehicles and ensuring smooth traffic flow.
Key Concepts
- -- Friction
- The force resisting the relative motion of solid surfaces, essential for safe vehicle operation and acceleration.
- -- Camber
- The cross slope of a road surface designed to facilitate drainage of rainwater.
- -- Unevenness Index
- A measure of vertical undulations in road surfaces, impacting vehicle comfort and safety.
- -- Carriageway Width
- The width of the roadway designated for the movement of vehicles, which is critical for traffic safety.
- -- Kerbs
- Structures marking the boundary between the road and other adjacent areas, important for traffic management.
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