Acceleration and deceleration should always be

• A. Abrupt
• B. Constant
• C. Variable
• D. Smooth

Answer: (D)

Smooth changes in speed are essential for safe driving. Gradual acceleration and gentle deceleration keep the vehicle stable, help the driver maintain control of steering and braking, and reduce the forces on the tires, suspension, and drivetrain. This makes it easier for other road users to predict your actions and reduces the chance of surprises that could lead to a skid, loss of control, or a rollover, especially in wet or slippery conditions. Abrupt changes can cause sliding, skidding, or loss of traction and put passengers at risk, while constant or highly variable patterns don’t provide the controlled, foreseeable transitions you want in everyday driving. So the best practice is to apply speed changes smoothly.