The Quarter

The Quarter is the fourth chapter of the campaign, The Parish, in Left 4 Dead 2. This chapter has a crescendo event in which to get across a roof to a balcony that contains a safe room, a parade float needs to be driven to create a bridge between the roof and balcony. The float (when activated) plays a loud, cheery tune that attracts the infected. This tune replaces the usual soundtrack that plays when fighting the horde.

Strategy
Most new players will camp on the roof while summoning the float. The thought process behind this notion is that players have a high vantage point from which to spot incoming Infected. This is actually one of the worst possible places to fight the horde as Smokers and Spitters can easily separate the Survivors, bringing them down into the mess below. Common Infected will also jump down from the rooftops above (inaccessible to the Survivors) in droves, swarming the rooftop in a matter of seconds if not sighted. The stair well is by far a better option. Common Infected do not generally use the stairwell of the condos and will not spawn from behind it. The result is that players are able to see the progress of the parade float bridge as well as have two funnels from which common infected can easily be shot down. It is recommended to have one player carry a shotgun for this area while another has a Sniper Rifle and a Magnum for long distance shots.

Trivia

 * The sign "Jules' Fresh Craw fish", which can be seen in the picture above, is also present in the Waterfront at the start of the map.
 * As the Survivors progress, the military effort to clean out the infected by bombing them into submission becomes evident. At various times, the Survivors call out to the military to stop bombing them.