When changing a lane, you should:

• Use your side mirrors or look over your shoulder to check blind spots in the direction you will be moving.
• Give a proper signal of your movement.
• Steer smoothly while maintaining the same speed.
• All of the above.
  Explanation:

  "

  When changing lanes, you should do the following: 
  1) Check your mirrors for a space in traffic where you can enter safely. 
  2) Check your blind spot by looking over your shoulder in the direction of the lane change. 
  3) Steer gradually into the new lane. Do not slow down, maintain the same speed or gently increase it.

  "