Customs is the second location in the game. It is a large industrial park next to the factory. Customs includes customs terminal, dorm, fuel oil storage, and many other infastructure buildings and objects. All of the 10 spawn locations are located west of the river.
Exits
At the Gas Station to reach Extraction you must go to an unlocked room, which has a chance of spawning rare loot, from that room go down the staircase and go through a second door that is unlocked, there is the extraction zone.
At the Warehouse to reach Extraction zone head to a small bunker that has a barbed wire surrounding it and head down the staircase, walk down to the end of the hall, there is the extraction zone. You can also find an ammo crate and a dead Scav in the hall.
At the Rail End extraction is also at the end of the hall in a bunker with an unlocked door.
Recommendations
It is recommended to bring an assault rifle or a carbine as customs is a mid-ranged map. If you are thinking to go into the dorms also bring a weapon for close combat, for example submachine gun or shotgun.
Camping on top of construction is a strong strategy as it takes only two players to control the bridge and everyone that is passing through it.