On the highway or on city streets going faster than the car ahead of you, or for that matter any of the cars in front of you will surely be a short-term situation. It will never get you to your destination any faster and will occasionally cause you a large delay when you hit the car in front of you, or the car behind you hits you when you stop suddenly.
So, this is a Grandpa asking all grandchildren to never be going faster than a car ahead of you. I will worry less and you will gain a habit that will not only save you a collision but also years of being more relaxed when behind the wheel.