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Definition of Geometric Design :
? Geometric design of highways deals with the dimensions and layout of 
visible features of the highway. 
? Geometric design fulfills the requirements of the driver and the vehicle, 
such as comfort, efficiency and safety.
? Proper geometric design will help in the reduction of accidents and their 
severity.
Page 2


Definition of Geometric Design :
? Geometric design of highways deals with the dimensions and layout of 
visible features of the highway. 
? Geometric design fulfills the requirements of the driver and the vehicle, 
such as comfort, efficiency and safety.
? Proper geometric design will help in the reduction of accidents and their 
severity.
Goals of Geometric design :
? Maximize the comfort, safety and economy of facilities.
? Provide efficiency in traffic operation.
? Provide maximum safety at reasonable cost.
? Minimize the environmental impacts.
Page 3


Definition of Geometric Design :
? Geometric design of highways deals with the dimensions and layout of 
visible features of the highway. 
? Geometric design fulfills the requirements of the driver and the vehicle, 
such as comfort, efficiency and safety.
? Proper geometric design will help in the reduction of accidents and their 
severity.
Goals of Geometric design :
? Maximize the comfort, safety and economy of facilities.
? Provide efficiency in traffic operation.
? Provide maximum safety at reasonable cost.
? Minimize the environmental impacts.
Factors affecting geometric design :
? Design speed.
? Topography.
? Traffic.
? Environmental factors.
? Economical factors.
? Vehicles properties (dimensions, weight, operating characteristics, etc.).
? Humans (the physical, mental and psychological characteristics of the driver and 
pedestrians like the reaction time).
Page 4


Definition of Geometric Design :
? Geometric design of highways deals with the dimensions and layout of 
visible features of the highway. 
? Geometric design fulfills the requirements of the driver and the vehicle, 
such as comfort, efficiency and safety.
? Proper geometric design will help in the reduction of accidents and their 
severity.
Goals of Geometric design :
? Maximize the comfort, safety and economy of facilities.
? Provide efficiency in traffic operation.
? Provide maximum safety at reasonable cost.
? Minimize the environmental impacts.
Factors affecting geometric design :
? Design speed.
? Topography.
? Traffic.
? Environmental factors.
? Economical factors.
? Vehicles properties (dimensions, weight, operating characteristics, etc.).
? Humans (the physical, mental and psychological characteristics of the driver and 
pedestrians like the reaction time).
Road alignment :
Alignment : is an arrangement in a straight line or in correct relative 
positions.
? The position or the layout of the central line of the highway on the 
ground is called the alignment.
? Horizontal alignment includes straight and curved paths. 
? Vertical alignment includes level and gradients.
Page 5


Definition of Geometric Design :
? Geometric design of highways deals with the dimensions and layout of 
visible features of the highway. 
? Geometric design fulfills the requirements of the driver and the vehicle, 
such as comfort, efficiency and safety.
? Proper geometric design will help in the reduction of accidents and their 
severity.
Goals of Geometric design :
? Maximize the comfort, safety and economy of facilities.
? Provide efficiency in traffic operation.
? Provide maximum safety at reasonable cost.
? Minimize the environmental impacts.
Factors affecting geometric design :
? Design speed.
? Topography.
? Traffic.
? Environmental factors.
? Economical factors.
? Vehicles properties (dimensions, weight, operating characteristics, etc.).
? Humans (the physical, mental and psychological characteristics of the driver and 
pedestrians like the reaction time).
Road alignment :
Alignment : is an arrangement in a straight line or in correct relative 
positions.
? The position or the layout of the central line of the highway on the 
ground is called the alignment.
? Horizontal alignment includes straight and curved paths. 
? Vertical alignment includes level and gradients.
Alignment decision is important because a bad alignment will enhance 
the construction, maintenance and vehicle operating cost. Once an 
alignment is fixed and constructed, it is not easy to change it due to 
increase in cost of adjoining land and construction of costly structures 
by the roadside.
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FAQs on PPT: Highway Geometric Design - Transportation Engineering - Civil Engineering (CE)

1. What is highway geometric design in civil engineering?
Ans. Highway geometric design in civil engineering refers to the process of designing the physical layout and dimensions of highways, including elements such as alignment, cross-section, and slope. It involves determining the appropriate curves, grades, widths, and other features that ensure safe and efficient movement of vehicles on the highway.
2. What factors are considered in highway geometric design?
Ans. Several factors are considered in highway geometric design. These include design speed, traffic volume, terrain, sight distance, and safety requirements. Design speed determines the maximum speed vehicles can safely travel on the highway, while traffic volume helps determine the appropriate number of lanes. Terrain affects the alignment and slope of the highway, and sight distance ensures that drivers have enough visibility to react to potential hazards.
3. How are curves designed in highway geometric design?
Ans. Curves in highway geometric design are designed by considering the design speed, radius, and super-elevation. The design speed determines the maximum speed vehicles can safely travel around the curve. The radius of the curve determines the sharpness of the curve, with larger radii indicating gentler curves. Super-elevation refers to the banking of the road to counteract the centrifugal force acting on vehicles, reducing the chances of skidding or overturning.
4. What is the importance of cross-section design in highway geometric design?
Ans. Cross-section design in highway geometric design is important as it determines the width, slope, and shape of the road. The width of the road is crucial for accommodating different types of vehicles and providing adequate space for maneuvering. The slope of the road affects drainage and stability, ensuring that water flows off the road surface and minimizing the chances of flooding or erosion. The shape of the road, such as the presence of shoulders or medians, also impacts safety and capacity.
5. How does highway geometric design contribute to road safety?
Ans. Highway geometric design plays a significant role in ensuring road safety. By considering factors such as sight distance, alignment, and super-elevation, it helps provide adequate visibility for drivers, reducing the risk of collisions. Proper design of curves and slopes helps vehicles navigate safely, minimizing the chances of skidding or overturning. Additionally, well-designed cross-sections accommodate different types of vehicles and allow for safe overtaking and maneuvering, enhancing overall road safety.
26 videos|91 docs|58 tests
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