Besides the port of entry where it is located, each station is also responsible for quarantining potentially infected travelers entering through any ports of entry in its assigned region. These facilities are fairly small; each one is operated by a few staff members and capable of accommodating 1–2 travelers for a short observation period. Cost estimates for setting up a temporary larger facility, capable of accommodating 100 to 200 travelers for several weeks, have been published by the Airport Cooperative Research Program (ACRP) in 2008 of the Transportation Research Board.