NICET - Highway Construction Inspection Practice Exam

What is the effect of cross-slope on water drainage?

1. It causes water to pool on the surface.

2. It allows water to run off to a drainage system.

3. It has no effect on drainage.

4. It increases water pressure on pavement.

The correct answer is: It allows water to run off to a drainage system.

The role of cross-slope is pivotal in managing water drainage on road surfaces. A properly designed cross-slope directs water away from the pavement towards appropriate drainage systems. This feature helps to prevent water accumulation on the road surface, reducing the likelihood of hydroplaning and other water-related issues. When the cross-slope is designed correctly, it promotes efficient runoff by guiding water towards ditches, culverts, or storm drains. This proactive measure ensures that water does not persist on the pavement, which can lead to deterioration of the road surface over time and contribute to safety hazards for vehicles. Effective drainage mitigates the risk of water pooling, which can lead not only to structural damage but also to potential accidents. In contrast, the other options imply adverse effects on drainage or a lack of influence, which does not align with the critical function that cross-slope plays in roadway design and water management.