Final answer:
In manual transmission vehicles, the driver must use the clutch and gearshift for every gear change. Advanced transmissions like DCTs and CVTs automate this process, improving fuel efficiency and reducing CO₂ emissions.
Step-by-step explanation:
The question pertains to automotive engineering, specifically the operation of a vehicle's transmission. In vehicles with a manual transmission, the driver must press the clutch and move the gearshift to select a new speed position or gear. Modern transmission technologies such as 7+ speeds, dual clutch transmissions (DCTs), and continuously variable transmissions (CVTs) have improved the fuel economy and reduced CO₂ emissions by allowing the vehicle to operate more efficiently.
Unlike manual transmissions, these advanced systems can automatically change gears without the driver's intervention. For an experiment measuring the impact of acceleration and braking on a vehicle, it would involve tasks like pressing harder on the accelerator pedal until reaching a certain velocity and recording the distance, or driving the car at a constant speed and then applying the brakes to measure the stopping distance.