No, a vehicle's speed does not directly affect a passenger's weight. The weight of a person remains constant regardless of the speed at which they are traveling in a vehicle. Weight is a measure of the gravitational force acting on an object and is not influenced by speed.
However, the perception of weight can be influenced by the acceleration or deceleration experienced in a moving vehicle. When a vehicle accelerates or decelerates, passengers may feel a sensation of being pushed back into their seats or pulled forward. This sensation is caused by the inertia of the passengers' bodies, which resists changes in motion. But this sensation does not change their actual weight.
It's important to note that traveling at high speeds can have other effects on passengers. Rapid acceleration or deceleration can exert additional forces on the body, leading to increased stress or discomfort. Additionally, the safety considerations and potential dangers associated with high-speed travel should always be taken into account.