What should you NOT do when taking a left turn?

On a left turn, make sure you reach the center of the intersection before you start the left turn. If you turn too soon, the left side of your vehicle may hit another vehicle because of off-tracking. If there are 2 turning lanes, always take the right turn lane. Do not start in the inside lane because you may have to swing right to make the turn. Drivers on your left can be more readily seen. [California Commercial Driver Handbook]