What factor does NOT affect stopping distance?

The correct choice indicates that a passenger's weight does not affect stopping distance. Stopping distance is primarily influenced by several critical factors: speed, road conditions, and the vehicle’s braking ability.

Speed is a vital component because the faster a vehicle is traveling, the longer it will take to come to a complete stop due to the increased momentum. Road conditions, such as whether the surface is wet, icy, or uneven, can greatly impact grip and traction, influencing how quickly a vehicle can stop. The vehicle’s braking ability directly correlates with stopping distance as well; more efficient brakes lead to shorter stopping distances.

While the weight of passengers and cargo can affect a vehicle’s overall handling and braking in terms of how it feels to the driver, it does not inherently change the fundamental physics of the stopping distance. Therefore, passenger weight is not a significant factor in determining how far a vehicle travels before it stops.