Question: How long is the route that connects Philadelphia to Lehigh County?

<P0-S0> Pennsylvania Route 145 (PA 145) is a 20.89 mi long north–south state highway in the Lehigh Valley area of eastern Pennsylvania. <P0-S1>  It connects Interstate 78 (I-78) and PA 309 in Lanark, Lehigh County to PA 248 in Weiders Crossing, Northampton County. <P0-S2>  PA 145 is the main north-south arterial into Allentown, the third-largest city in the state. <P0-S3>  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. <P0-S4>  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. <P0-S5>  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. <P0-S6>  MacArthur Road is the location of the main commercial center of the Lehigh Valley. <P0-S7>  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. <P0-S8>  The route continues along the east bank of the river and passes through Walnutport before reaching its northern terminus. <P0-S9>  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. <SEP> <P1-S0> Allentown (Pennsylvania Dutch: "Allenschteddel") is a city located in Lehigh County, Pennsylvania, United States. <P1-S1>  It is Pennsylvania's third most populous city and the 224th largest city in the United States. <P1-S2>  As of the 2010 census, the city had a total population of 118,032 and is currently the fastest growing city in all of Pennsylvania. <P1-S3>  It is the largest city in the metropolitan area known as the Lehigh Valley, which had a population of 821,623 residents as of 2010 . <P1-S4>  Allentown constitutes a portion of the New York City Combined Statistical Area and is the county seat of Lehigh County. <P1-S5>  In 2012, the city celebrated the 250th anniversary of its founding in 1762. <SEP> <P2-S0> Pennsylvania Route 309 (PA 309) is a major highway which runs for 134 miles (216 km) through Pennsylvania in the United States. <P2-S1>  The route runs from the interchange between PA 611 and Cheltenham Avenue on the border of Philadelphia and Cheltenham Township north to an intersection with PA 29 in Bowman Creek, a village in Monroe Township, Wyoming County. <P2-S2>  It connects Philadelphia and its northern suburbs to Allentown, Hazleton, and Wilkes-Barre. <P2-S3>  A limited-access highway portion of PA 309 in the Wilkes-Barre area is known as the North Cross Valley Expressway. <P2-S4>  A limited-access highway portion of PA 309 in Montgomery County is known as the Fort Washington Expressway. <P2-S5>  PA 309 parallels the newer Interstates 476 and 81 for much of its length. <SEP> <P3-S0> Pennsylvania Route 863 (PA 863) is a state highway in Lehigh County, Pennsylvania. <P3-S1>  The route runs 13.99 mi from U.S. Route 222 (US 222) in Upper Macungie Township north to PA 143 in Lynn Township. <P3-S2>  The route is a two-lane undivided road that runs southeast-northwest through rural areas in western Lehigh County. <P3-S3>  Along the way, PA 863 has an interchange with Interstate 78 (I-78)/US 22 in Weisenberg Township. <P3-S4>  The road was originally unpaved, being improved to a bituminous road by the 1940s and a paved road by 1950. <P3-S5>  PA 863 was designated in the 1960s.