Why winding road is easier for vehicles to travel up a hill?

Winding roads, or switchbacks, are easier for vehicles to travel up a hill because they reduce the steepness of the ascent. By creating a series of gradual turns, they allow vehicles to maintain momentum and reduce strain on the engine. This design also minimizes the risk of losing traction, making it safer and more manageable for drivers when navigating steep terrains. Overall, the gradual incline and reduced slope make it more efficient for vehicles to climb hills.