Learning about acceleration, deceleration, and speed can help you judge time and space more accurately thus helping you to be a safe driver.

How Are Acceleration, Deceleration, and Speed Related?

The rate of acceleration is the time it takes to accelerate from one speed to another. The rate of deceleration is the time it takes to decelerate from one speed to another. Several factors affect a car’s acceleration, including the power of the engine, the transmission and differential gear ratios, adhesion between the drive wheels and the road surface, and the weight the engine is pulling. Your ability to drive safely and effectively depends in large part on the knowledgeable use of your car’s acceleration. 

• Acceleration and Deceleration Rates Vary 

Rate of acceleration varies with speed. At higher speeds, a car’s rate of acceleration is lower. Understanding this principle is important for risk management. At higher speeds, your car’s rate of deceleration is lower. A vehicle’s rates of acceleration and deceleration vary with weight. 

• Maintaining a Constant Speed

The ability of vehicles to maintain a given speed varies greatly. Many large vehicles have difficulty maintaining their speed as do underpowered subcompact cars.

• Monitoring Your Speed

With experience you’ll become more aware of clues to your car’s performance and speed. Drivers of manual transmission cars must make a special effort to learn to judge speed, because they have to make speed related decisions about shifting gears. The greater your speed the greater the distance needed to brake the car to a stop.