Improved Overrun

Improved Overrun (Combat)
You are skilled at running down your foes.
Benefit: You do not provoke an attack of opportunity when performing an overrun combat maneuver. In addition, you receive a +2 bonus on checks made to overrun a foe. You also receive a +2 bonus to your Combat Maneuver Defense whenever an opponent tries to overrun you. Targets of your overrun attempt may not chose to avoid you.

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(BAB +6): You receive an additional +2 bonus on checks made to overrun a foe. Whenever you overrun opponents, they provoke attacks of opportunity if they are knocked prone by your overrun.