What effect does hot weather have on tar in road pavement?

What effect does hot weather have on tar in road pavement?

• A. It hardens the tar for better durability
• B. It becomes gummy, causing tires to stick
• C. It causes the road to become uneven
• D. It bleeds, making the surface slippery

Answer: (D)

When temperatures rise during hot weather, the tar used in road pavement can heat up and begin to bleed. This means that the tar becomes softer and may rise to the surface of the pavement. As a result, the road becomes more susceptible to a slippery surface, which can pose a hazard for vehicles, particularly in terms of traction. Drivers need to be aware of this potential for slick conditions, especially when there is a combination of high temperatures and vehicle weight or speed. Choosing this correct response underscores the importance of understanding how environmental conditions can affect road materials and safety. Other effects, like hardening or becoming gummy, are less relevant as they do not accurately describe the behavior of tar in hot weather under the pressure and heat experienced on roads.

When temperatures rise during hot weather, the tar used in road pavement can heat up and begin to bleed. This means that the tar becomes softer and may rise to the surface of the pavement. As a result, the road becomes more susceptible to a slippery surface, which can pose a hazard for vehicles, particularly in terms of traction. Drivers need to be aware of this potential for slick conditions, especially when there is a combination of high temperatures and vehicle weight or speed.

Choosing this correct response underscores the importance of understanding how environmental conditions can affect road materials and safety. Other effects, like hardening or becoming gummy, are less relevant as they do not accurately describe the behavior of tar in hot weather under the pressure and heat experienced on roads.