Bridgeport Hospital is located approximately 17 miles south of Yale on I-95. Bridgeport, CT is a blue collar town with certain neighborhoods which provide much of the trauma experience for the surgical residents rotating there. Most of the Bridgeport residents do not actually choose to live there.
As far as Bridgeport's affiliation with YNHH, Bridgeport Hospital itself does not accept surgery or pediatrics residents. Instead Yale surgical and pediatrics residents rotate through.
Bridgeport does accept medicine, med/peds, radiology, and ob-gyn residents and I do not believe they rotate through Yale-New Haven Hospital. Therefore, Bridgeport's affiliation with Yale pertains mostly to surgery and pediatrics.
Hope this helps.