Why should you not drive too slowly on an expressway?

• It increases fuel efficiency.
• It allows better control in case of emergencies.
• It creates a smoother traffic flow.
• It disrupts the normal flow of traffic and poses a hazard.
  Explanation:

  "Driving too slowly is against the law because it disrupts the normal flow of traffic and poses a hazard. Always drive at a safe speed for the conditions, such as traffic flow, rain, snow, etc."