Final answer:
Drivers often use the guideline of allowing two hours for every 100 miles traveled to estimate trip durations and account for breaks or delays.
Step-by-step explanation:
A general guideline used by many drivers is to allow two hours for every 100 miles they travel. This rule of thumb helps with estimating the length of a trip and accounting for short breaks or unexpected delays. It is assuming a base speed of about 50 miles per hour, including stops. This is a practical approach to travel planning that helps ensure drivers have a reasonable expectation of travel time.