State Route 1002 (SR 1002), locally known as Tilghman Street and Union Boulevard, is a major 13.8 mi (22.2 km) long east–west road in the Lehigh Valley region of eastern Pennsylvania.

It becomes Union Boulevard just east of the bridge over the Lehigh River in Allentown; SR 1002 ends at the interchange with Pennsylvania Route 378 in Bethlehem.

Union Boulevard continues over Monocacy Creek, which forms the border between Lehigh and Northampton Counties, and ends in downtown Bethlehem.

[4] When the state began taking over Pennsylvania highways following passage of the Sproul Road Bill, signed May 31, 1911,[5] this system did not include the direct Allentown to Harrisburg route to which Interstate 78 belonged.

LR 159 was redefined to begin at the same point, continuing on Union Boulevard to Main Street in downtown Bethlehem and beyond to Easton.

as of 1999[update], the two roads have a combined eight diners, dating back to the early 20th century, that serve as a historical reminder of its past.

[20] In the 1950s, with the opening of these two highways and the western extension of the Thruway,[13] no signed Traffic Routes remained on Tilghman Street and Union Boulevard.

As Tilghman Street approaches the limited-access U.S. Route 22, the road splits into two carriageways in preparation for an interchange with US 22, northeast of where US 22 separates from Interstate 78.

[28] At an intersection with Werley Road, SR 1002 connects to Interstate 476, the Northeast Extension of the Pennsylvania Turnpike, via a ramp leading to the toll plaza for the nearby I-476/US 22 interchange.

Tilghman Street then re-enters South Whitehall for about one block as it crosses Cedar Crest Boulevard, a local north–south arterial, before entering into the city's incorporated limits for a second time.

[29] In the more populated part of the city, SR 1002 intersects the 6th and 7th street one-way couplet forming Pennsylvania Route 145.

[28] Approximately 1,500 feet[1] east of the Allentown's border with Bethlehem, Eaton Avenue is concurrent with SR 1002  for one-tenth of a mile.