Question: What purpose do both the F-Shaped barrier and the Jersey barrier serve?
Context: Pennsylvania Route 145 (PA 145) is a 20.89 mi long north–south state highway in the Lehigh Valley area of eastern Pennsylvania.  It connects Interstate 78 (I-78) and PA 309 in Lanark, Lehigh County to PA 248 in Weiders Crossing, Northampton County.  PA 145 is the main north-south arterial into Allentown, the third-largest city in the state.  The route enters the city on South 4th Street and follows multiple streets to downtown, where it follows the one-way pair of 6th Street northbound and 7th Street southbound.  North of Allentown in Whitehall Township, a seven-mile (11.2 km) portion of PA 145 is known as MacArthur Road, named in honor of General Douglas MacArthur.  MacArthur Road is a divided highway; between U.S. Route 22 (US 22) and Eberhart Road, it is six lanes wide with a Jersey barrier and jughandles while the remainder of the road a four-lane divided highway.  MacArthur Road is the location of the main commercial center of the Lehigh Valley.  North of Eagle Point, PA 145 becomes a two-lane undivided road that parallels the Lehigh River, crossing the river into Northampton County at Treichlers.  The route continues along the east bank of the river and passes through Walnutport before reaching its northern terminus.  PA 145 is dedicated as the Battle of the Bulge Veterans Memorial Highway in honor of the veterans who fought in the Battle of the Bulge. The New York Harbor Storm-Surge Barrier is a proposed flood barrier system to protect New York-New Jersey harbor estuary shores from storm surges.  The proposed system would consist of one barrier located across the mouth of Lower New York Bay between Sandy Hook (N.J.) and Far Rockaway (N.Y.) and second on the upper East River to provide a ring of protection to most of the bi-state region. In electronics/spintronics, a tunnel junction is a barrier, such as a thin insulating layer or electric potential, between two electrically conducting materials.  Electrons (or quasiparticles) pass through the barrier by the process of quantum tunneling.  Classically, the electron has zero probability of passing through the barrier.  However, according to quantum mechanics, the electron has a non-zero wave amplitude in the barrier, and hence it has some probability of passing through the barrier.  Tunnel junctions serve a variety of different purposes. A Jersey barrier or Jersey wall is a modular concrete or plastic barrier employed to separate lanes of traffic.  It is designed to minimize vehicle damage in cases of incidental contact while still preventing the crossover case of a head-on collision.  Jersey barriers are also used to reroute traffic and protect pedestrians and workers during highway construction, as well as temporary and semi-permanent protections against landborne attack such as suicide vehicle bombs.  A Jersey barrier is also known in the western United States as K-rail, or K-wall, a term borrowed from the California Department of Transportation specification for temporary concrete traffic barriers, or colloquially as a Jersey bump.  Plastic water-filled barriers of the same general shape are also now commonly called Jersey barriers. The Barnegat Peninsula, also known as the Island Beach Peninsula or Barnegat Bay Island and colloquially as "the barrier island", is a 20 mi long, narrow barrier peninsula located on the Jersey Shore in Ocean County, New Jersey, that divides the Barnegat Bay from the Atlantic Ocean.  It is a vacation destination and summer colony area and is heavily dependent on tourism, real estate and fishing.  Notable communities on the peninsula include Point Pleasant Beach, Bay Head, Mantoloking, Lavallette, Ortley Beach, Seaside Heights, Seaside Park and the South Seaside Park section of Berkeley Township.  The southern 10 mi of the barrier island are preserved in their natural state as Island Beach State Park, New Jersey's longest stretch of undeveloped coastline. The Delaware Water Gap Toll Bridge (also known as the Interstate 80 Toll Bridge) is a toll bridge that carries Interstate 80 across the Delaware River at the Delaware Water Gap, connecting Hardwick Township, Warren County, New Jersey and Delaware Water Gap, Monroe County, Pennsylvania, in the United States.  The bridge was built by the Delaware River Joint Toll Bridge Commission.  The 2465 ft -long bridge is a multiple span dual roadway with a steel plate structure.  The roadways are 28 ft wide each and separated from each other by a concrete Jersey barrier. A cable barrier, sometimes referred to as guard cable or wire rope safety barrier (WRSB), is a type of roadside or median safety traffic barrier/guard rail.  It consists of steel wire ropes mounted on weak posts.  As is the case with any roadside barrier, its primary purpose is to prevent a vehicle from leaving the traveled way and striking a fixed object or terrain feature that is less forgiving than itself.  Also similar to most roadside barriers, cable barriers function by capturing and/or redirecting the errant vehicle. The F-shape barrier is a concrete crash barrier, originally designed to divide lanes of traffic on a highway.  It is a modification of the widely used Jersey barrier design, and is generally considered safer. Barrier analysis is a rapid assessment tool used in behavior change projects.  The purpose of barrier analysis is to identify behavioral determinants, so that more effective behavior change, communication messages, strategies, and supporting activities can be developed.  Barrier analysis is a relatively easy approach that can be conducted in a short period of time, allowing implementers to quickly make decisions based on the findings.  This method has been used in 38 countries by 34 organizations.  The training manual is available in English, Spanish, French, and Arabic. The River Foss Barrier is a floodgate that straddles the River Foss in York, England at the confluence of the Rivers Ouse and Foss just south of Clifford's Tower.  The barrier was opened in 1988 after flooding from the Foss and two other becks caused more damage to properties in the city than when the Ouse was in spate.  The purpose of the barrier is to prevent backing up of floodwater from the Foss when it meets the surgewater of the Ouse and cannot drain away.  The pumps adjacent to the barrier move water from the Foss into the Ouse.
Answer: employed to separate lanes of traffic