Widening of Pavement

TL;DR

Extra widening is the additional width of the road required on curved sections to accommodate vehicle maneuverability and driver tendencies, with both mechanical widening and psychological widening playing a role.

Transcript

welcome friends now we will be learning about the next topic that is extra winding on course so what is extra widening extra widening is nothing but the small width which is provided to the horizontal curve is called extra widening it also depends on the radius if the radius is small then the more width is provided at the curve if the radius is lar... Read More

Key Insights

• 🚙 Extra widening is the addition of width to the road on curved sections to accommodate vehicle movement and driver tendencies.
• 🦾 Mechanical widening is caused by the off-tracking of the rear wheels, while psychological widening is provided for greater driver maneuverability.
• 👾 Extra widening is crucial for safety, providing space for vehicles to navigate curves smoothly and preventing skidding.
• 🧑‍🏭 The amount of extra widening needed depends on factors such as curve radius and design speed.
• ✈️ Multi-lane roads require additional widening calculations to allocate the extra width to each lane.
• 🪛 Psychological widening is influenced by driver tendencies to maintain clearance from obstacles, such as hills or valleys.
• 👾 Off-tracking of the rear wheels on curves increases the effective width of the road, necessitating extra space for vehicles.

Questions & Answers

Q: What is extra widening on curves?

Extra widening refers to the additional width of the road required on curved sections to ensure vehicle maneuverability and accommodate driver tendencies.

Q: What causes mechanical widening?

Mechanical widening occurs due to the off-tracking of the rear wheels, where the rear axle follows a shorter radius than the front axle, resulting in the need for increased road width.

Q: Why is psychological widening important?

Psychological widening is necessary to provide additional pavement space for greater steering maneuverability, accommodating higher speeds, and allowing for clearance around the vehicle.

Q: How is extra widening applied in road design?

The total widening (mechanical and psychological) is divided by two and provided on either side of the road, depending on the curve's radius. In some cases, widening is allocated solely to the inner or outer side.

Summary & Key Takeaways

• Extra widening is the increased width of the road on curved sections, typically ranging from 0.5 to 1 meter, depending on the curve's radius.

• Mechanical widening is caused by the off-tracking of the rear wheels, where the front and rear axles follow different paths, requiring additional road space.

• Psychological widening is the extra pavement provided for driver maneuverability and to accommodate vehicle overhang.