If you look at the edge of one of the blocked streets, there are some scattered papers. you can read one of them, it says 'dog house' and the name of a street (Ican't remember which). go to that street and find a house with a dog kennel outside it. Inside the kennel you find a key which you can use on the house. inside the house there is a save point and then you can walk through the back garden to get to the other side of the obstructions.

I hope that helps you!

Oh, I forgot something! when you try to go out of the back door of that house, you will find that you need three keys. look on the poster next to the door and you'll see their locations.

Look on the map and go down Levin ST. As you walk down the street the camera will close up on some papers. Walk over to them and when u examine them it will say DOG HOUSE, LEVIN STREET go back down Levin street and look for a dog house, kill the two dogs and examine the kennel. Then the guy (cant remember his name, James Sanderland i think) will bend down and will find a house key inside the kennel then walk up up to the house door and James will unlock it, walk thru and there will be a medi-pak, hangun ammo and health drinks somewhere then examine the back door and there will be three locks. Examine the poster to find the key locations
Scarecrow key: in a mail box at the end of a long road
Lion key: In the back of a cop car at the end of another long road (north of convienience store)
Woodsman key: Down an alley above the caf'e where ya meet Cybil
Then return to the dog house and insert the three keys. When u step outside it will be dark, turn on ur flashlight and follow ur map to the school, lot of monsters and hard to see.

Hope this helps