Polo Rules

My three favourite bike polo rules are now:

1. Defending players must challenge another player from as shallow an angle as possible (challenging an attacker at 90 degrees is dangerous and will result in a penalty).
   
2. Attacking players must keep their heads up at all times (not looking where you are going is dangerous and will result in a penalty).
   
3. Riding into another player with your front wheel is forbidden (this is a t-bone and will result in a penalty).
   
   

Are these rules proposed?