urban and heavily developed areas, Interstates may travel along surface roads or have at-grade intersections with stop signs or traffic lights. The reason for this is usually because the Interstate started construction after the land was heavily developed and buildings such as residences and businesses and other roads would have to be removed to allow a freeway to pass through. Additionally, more developed land would have to be cleared for space to build interchanges to connect the Interstate and surface streets. This situation is extremely uncommon as Interstates are usually built around cities or through them on pre- or lightly developed land. I-516 downgrades to an expressway as it heads toward its eastern terminus. The expressway features a frontage road right turn and an at-grade intersection with Mildred Street close to the terminus at Montgomery Street and Derenne Avenue (SR 21) in Savannah, Georgia. Mildred Street southbound is closed by concrete barriers. I-19 between North West Street and its southern terminus at West Crawford Street at North Sonoita Avenue, in Nogales, Arizona, consists of surface streets with traffic lights. The reason for the signage of this segment is to help direct traffic entering from Mexico to the nearest interstate. Interstate 69E in Brownsville, Texas passes through an at-grade signalized intersection with University Avenue/East Boulevard, as well as a minor intersection with Courage Street, before passing through the Brownsville – Veterans Port of Entry and crossing the Veterans International Bridge. I-70 uses part of US 30 along a surface road in Breezewood, Pennsylvania. Traffic traveling eastbound on I-70/I-76 must exit and travel a short distance on US 30 in order to continue south on I-70 heading to Hancock, Maryland. (The routing is similar for traffic following I-70 in the opposite direction: traffic traveling north on I-70 must exit and travel a short distance on US 30 in order to continue west on I-70/I-76 or to enter the Pennsylvania Turnpike.) This is one of very few instances of traffic lights on an Interstate. There was formerly a sign of a policeman pointing at drivers leaving the Pennsylvania Turnpike to enter US 30, saying, "You! Slow Down!" Local businesses have lobbied to keep the gap to avoid a perceived potential loss of business (Map). I-676 eastbound has a surface street section at the west end of the Ben Franklin Bridge in Philadelphia, Pennsylvania, because of historically significant areas. Signage and the Federal Highway