What are common factors that reduce traction?

Factors that reduce traction are primarily related to the conditions present on the road surface and the immediate environment affecting the vehicle's ability to maintain grip. The correct choice encompasses various elements that directly influence traction.

Substances on roads, such as oil, gravel, or debris, can create a slippery surface that hinders tire grip. Surface conditions, including wet, icy, or uneven pavement, also affect traction significantly. Hydroplaning occurs when tires lose contact with the road due to water buildup, leading to a loss of control, and this phenomenon is crucial in understanding how water and weather impact traction. Additionally, temperature changes can affect the road surface and tire performance, influencing how well the tires grip the pavement.

The other choices may include elements that are less relevant to the direct reduction of traction. Weather conditions are indeed impactful, but they are more general and could overlap with surface conditions. Fuel type and traffic lights do not have a direct relationship to traction. Similarly, vehicle weight, driver skill, and engine power might contribute to vehicle control but are not intrinsic factors that reduce traction itself. Lastly, road markings, reflective signs, and elevation changes influence driving but do not fundamentally alter the tire-road contact needed for traction.