If It's Twenty Four Hour Silence...

So Ancaster Hall is meant to have a twenty four hour silence policy, to allow students to study for their impending exams. However, although I am aware that I would be in serious trouble if I did so much as turn my music up louder than absolutely necessary, or watched TV online without headphones, I am also aware that there are several things stopping the silence. So my ponderance today is:
If Ancaster Hall is meant to be silent twenty four hours a day, then why...:

• ... Do large, very loud lorries drive past my room periodically between the times of 06:00 and at least 15:30?
• ... Is the idiot in the room below me allowed to play his ridiculously loud dubstep/club music so that I can hear it through my floor, when I can't even have my radio loud enough to be able to hear it in my own bathroom?
• ... Have the girls upstairs been throwing things out of their window for no apparent reason and then spending half an hour yelling at each other from the ground to the second floor trying to get it out of the spiky bushes that they know are incredibly spiky (designed to prevent intruders)?
• ... Have the aforementioned girls got very cross with me when I shouted out the window telling them to be quiet as it's meant to be silent?
• ... Are the boys outside allowed to stand almost directly outside my room and play (very loud) football? 
• ..., if all the above are true, am I not allowed to watch a film with my friends?