What is the highest point on a carriage way?

The Subtle Rise: Why Roads Aren’t Always Flat

Have you ever noticed that roads, especially two-lane ones, seem to slope slightly towards the edges? This isn’t a mistake, but a deliberate design element known as the crown. This subtle high point running along the center of the carriageway plays a crucial role in keeping us safe on the road.

The crown’s primary function is water management. Imagine a perfectly flat road surface after a downpour. Rainwater would pool, creating hazardous driving conditions and potentially leading to aquaplaning. The crown’s gentle slope ensures that water naturally flows towards the shoulders and into the drainage systems, keeping the road surface as dry as possible.

This constant runoff offers several key benefits:

• Improved Traction: A dry road surface provides significantly better tire grip, allowing for shorter braking distances and more responsive handling.
• Reduced Risk of Aquaplaning: By minimizing water buildup, the crown helps prevent vehicles from losing contact with the road surface at speed, a dangerous phenomenon known as aquaplaning.
• Increased Road Longevity: Standing water can weaken the road surface over time, leading to potholes and cracks. Effective drainage thanks to the crown helps to prolong the lifespan of the roadway.

The next time you’re driving, pay attention to the road’s subtle curvature. This seemingly insignificant detail is a testament to the careful engineering that goes into our transportation infrastructure, ensuring safer and more efficient journeys for everyone.