When should a rider use a dash?

A rider should use a dash in the following instances:

1. To indicate a sudden break or interruption in thought or sentence structure.
Example: "The car screeched to a halt—just in time to avoid hitting the pedestrian."

2. To replace a colon or a pair of commas when indicating a sudden shift or emphasis in a sentence.
Example: "She loved three things—reading, painting, and cooking."

3. To emphasize a word or phrase within a sentence.
Example: "He was determined—absolutely determined—to win the race."

4. To indicate a range or span of numbers, dates, or times.
Example: "The event will take place from 8:00 am–2:00 pm."

Note: It is important to use dashes sparingly and appropriately to avoid overusing them or causing confusion in the sentence.