What should you do before leaving a parallel parking spot?

• Honk your horn to alert other drivers
  Explanation:

  "When preparing to leave a parallel parking spot, look over your shoulder and in the rearview mirrors, and wait until the way is clear before pulling into traffic."
• Look over your shoulder, check rear view mirrors, and wait until the way is clear before pulling into traffic
• Signal and immediately pull out without looking
• Reverse a little to gain momentum before pulling out