The Construction Site

The Construction Site is the third chapter of the third campaign, Dead Air. In this chapter, the Survivors exit the safe room and walk down an alleyway to find themselves in an unfinished construction site. The survivors find the way to the next alley blocked, and use gas canisters to burn the barricade that is in the way. Upon lighting the gas, a horde is alerted, and the survivors must fight off the horde until the wood is burned away. Once this is achieved the survivors cross a street to a power plant. After going through the power plant, they come out under a collapsed highway bridge in front of the airport, with the remains of a crashed plane tossed about the area. The survivors fight their way across the Infected filled highway and into the airport car park, they cross the sky bridge into the terminal and into a safe room at the end of the chapter.

Tactics
Also see: Tactics

All campaign walkthroughs are done on Normal difficulty in single player, and are meant to give tips on what to do and generally point out things that might otherwise be missed.

There are, of course, a few key things to always remember:

Stop, look, and listen.

Stopping to observe your surroundings might allow you to prepare for something nasty, like a Witch, Tank, or special Infected in a really bad place for them to be. Things can always get worse.

Are you and your teammates all hurting, your health down under 50%? Well, guess what? The Director is feeling particularly sadistic; you are now facing a Tank with Tier 1 weapons.

Teamwork. This cannot be stressed enough. Left 4 Dead is supposed to be a cooperative game. Communicate with your teammates, if you're playing with others, or if you're by yourself with the AI, point out things they might otherwise miss. In all cases, watch out for each other and take care of each other. You are not going to survive the zombie apocalypse by yourself. Be ready for anything. Don't panic.

Campaign
Tier 1 Weapons
 * Bill will grab a Pump shotgun
 * Francis will grab a Pump shotgun
 * Zoey will grab a Pump shotgun
 * Louis will grab a Pump shotgun

Tier 2 Weapons
 * Bill will grab an Assault rifle
 * Francis will grab an Auto shotgun
 * Zoey will grab a Hunting rifle
 * Louis will grab an Assault rifle

You start off in the safe room with health packs and Tier 1 weapons. Once your all patched up and loaded with ammo head outside. You will be in the back of the Self-Storage building. you can either go left down the alley or go around the storage rooms to an open one that sometimes has ammo and supplies in it. Follow it and it will lead you to th construction site.

Once here take out the few horde that are around and get ready to blow the barricade. There should be some Gas cans around and maybe some Tier 2 weapons. Now there are three tactis I know when here:

1. Climb up the ladder you see when you first enter the site. There are usually Molotov cocktail and Pipe bomb there. You can stay there, blow the barricade, and fight off the horde.

2. Climb up the ladder, cross the wooden bridge and stay there, blow the barricade, and fight off the horde.

3. Enter the two story building and one the first floor there is a closet. Have someone blow the barricade and run back. Once its clear move on.

After it's done go down the alley way. There shopuld be some ammo and a pistal at the end. There you will cross a street to an electrical plant. Make your way through it, but be careful because special infected love to be here. Then you will see a building with a giant propane tank in front of it. Go through it and in will take you out side the Airport.

Here, make your way around the rubble, from a crashed plane. Be care because Tanks and witches are crawling over here. Eventually you will see a two-story car lot.

Enter the building taking out any of the horde you see. Go up to the second level and make your way to a stair case on the other side. Once here go up it and you will enter a long hallway that leads to the saferoom. After that take a breather and heal yourselves. Get ready for The Terminal.

Tips

 * It's worth it to note that the survivors can light the barricade on fire and run back to the safe room, from the second level of the construction site, to fight the horde a cheap, easy way.


 * The series of raised platforms is a good, and obvious, spot to defend yourself from the horde, and often comes with a supply of Molotovs or Pipe Bombs.

It is possible to skip lighting the barricade in this level. There is a small staircase in front of the barricade. Jump onto the railing, run down it and leap over onto the electrical boxes on the wall to your left. It will probably take a few tries, but it can be done. Once on the boxes, run down the length and jump towards the barricade. If done correctly, you'll land on top of the barricade and be able to jump down to the other side. Keep in mind that this can't be done if your low health has impaired your speed, and it's wise to keep one person on the barricade at all times until your entire team has made it past, since it's impossible to get back over it or shoot through it to help a teammate in trouble. Also, AI survivors will eventually teleport to you.
 * NOTE: This is considered an exploit!