A crowned road? a. is a road that has rain grooves b. is higher in the middle than on the sides c. has worn tire paths from heavy traffic d. includes a grated bridge deck
The Correct Answer and Explanation is :
The correct answer is b. is higher in the middle than on the sides.
Explanation
A crowned road is designed with a slight elevation in the center, creating a shape that resembles a dome or crown. This design feature is crucial for proper drainage and road safety. The crown helps direct rainwater away from the surface of the road, preventing the accumulation of water that could lead to hydroplaning and reduced traction for vehicles. By allowing water to flow off to the sides, the road remains safer for drivers, especially during heavy rain.
Additionally, the sloped design minimizes erosion and wear on the road surface. When a road is flat or low in the middle, water can pool, causing damage to the asphalt or concrete over time, leading to potholes and other structural issues. The crowned shape also supports the integrity of the road, extending its lifespan and reducing maintenance costs.
Crowning is particularly important in areas with heavy rainfall or where snowmelt occurs, as it ensures that water does not sit on the surface. Moreover, roads with a crown are easier to maintain since they are less susceptible to damage from water and wear from traffic.
The concept of a crowned road is commonly applied in various types of road construction, from residential streets to highways. Proper crowning, typically around a 2% to 3% slope from the center to the edges, helps ensure the roadway remains functional and safe for all types of vehicles.
In summary, the crowned design of a road plays a vital role in its durability and performance, significantly impacting safety and maintenance, making it an essential aspect of roadway engineering.