APSC AE WRD 2019 PYQ: Superelevation for Bullock Cart

Superelevation for Bullock Cart Multiple Choice Question

Question: To prevent the overturning of a bullock cart on curves, the maximum superelevation prescribed by IRC is:
(A) 1 in 5
(B) 1 in 10
(C) 1 in 15
(D) 1 in 20

Answer: (C) 1 in 15

Explanation

According to the Indian Roads Congress (IRC: 38-1988 - Design Tables for Horizontal Curves for Highways and IRC: 73-1980 - Geometric Design Standards for Rural Roads), the maximum superelevation allowed on horizontal curves is 1 in 15 (or approximately 6.7%). This limit is designed to prevent overturning of slow-moving vehicles, such as bullock carts, animal-drawn vehicles, and heavily loaded trucks, which have a higher center of gravity and are more prone to tipping on curves.

Key Notes

• The superelevation of 1 in 15 ensures stability for vehicles with high centers of gravity, like bullock carts, on curved road sections.
• This standard is particularly relevant for rural roads, where slow-moving vehicles are common, as outlined in IRC: 73-1980.
• Excessive superelevation (e.g., 1 in 5) could cause instability for slow-moving vehicles, while lower values (e.g., 1 in 20) may not provide sufficient lateral force resistance.
• Proper superelevation design is critical in civil engineering to ensure safe and efficient road networks.

Note: The 1 in 15 superelevation limit prescribed by IRC ensures the safety of slow-moving vehicles like bullock carts on curved roads, balancing stability and traffic flow in rural road design.

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