You are driving your car in good weather and road conditions. The proper way to ensure that you are following far enough behind other cars is to
A: Look at the other cars around you, and use the same following distance they are using.
B: Try to estimate how many car-lengths you are behind the vehicle ahead of you. You should
always be at least three car lengths behind them.
C: Watch as the vehicle ahead of you goes past a road sign or fence post. It should take at least
three seconds for you to reach the same spot on the road.

anticipatory breach of contract

as the name suggests, an anticipatory breach is a breach of contract before the time of performance. so, if a promisor denies to perform his promise and signifies his unwillingness before the time for performance, then it is an anticipatory breach of contract.

and

actual breach of contract

while an anticipatory breach is before the time of performance, an actual breach of contract is on the scheduled time of performance of the contract. an actual breach of contract can be committed either.

hope this . : )