Operating a motor vehicle at a slower speed then the rest of traffic is...?

• Permitted if you are unaware of the speed limit
• A hazard since other drivers may become frustrated or angry and try to pass you
  Explanation:

  "A hazard since other drivers may become frustrated or angry and try to pass you"
• A hazard only when your speed is less than 70% of all other freeway speed
• Considered safe if there is bad weather