The Central Artery/Tunnel Project (CA/T), commonly known as the Big Dig, was a megaproject in Boston that rerouted the Central Artery of Interstate 93 (I-93), the chief highway through the heart of the city, into the 1.5-mile (2.4 km) tunnel named the Thomas P. O'Neill Jr. Tunnel. The project also included the construction of the Ted Williams Tunnel, the Leonard P. Zakim Bunker Hill Memorial Bridge over the Charles River, and the Rose Kennedy Greenway in the space vacated by the previous I-93 elevated roadway. Initially, the plan was also to include a rail connection between Boston's two major train terminals. Planning began in 1982; the construction work was carried out between 1991 and 2006; and the project concluded on December 31, 2007, when the partnership between the program manager and the Massachusetts Turnpike Authority ended.
The New Jersey Turnpike (NJTP) is a system of controlled-access highways in the U.S. state of New Jersey, maintained by the New Jersey Turnpike Authority (NJTA). The 117.20-mile (188.62 km) mainline's southern terminus is at a complex interchange with Interstate 295 (I-295), U.S. Route 40 (US 40), US 130, and Route 49 near the border of Pennsville and Carneys Point townships in Salem County, one mile (1.6 km) east of the Delaware Memorial Bridge. Its northern terminus is at an interchange with I-80 and US 46 in Ridgefield Park, Bergen County. Construction of the mainline from concept to completion took 23 months, from 1950 to 1952. It was officially opened to traffic on November 5, 1951, between its southern terminus and exit 10.
The Pennsylvania Turnpike is a toll highway operated by the Pennsylvania Turnpike Commission (PTC) in the US state of Pennsylvania. A controlled-access highway, it runs for 360 miles (580 km) across the state. The turnpike's western terminus is at the Ohio state line in Lawrence County, where the road continues west as the Ohio Turnpike. The eastern terminus is at the New Jersey state line at the Delaware River–Turnpike Toll Bridge over the Delaware River in Bucks County, where the road continues east as the Pearl Harbor Memorial Extension of the New Jersey Turnpike.
Interstate 93 (I-93) is an Interstate Highway in the New England states of Massachusetts, New Hampshire, and Vermont in the United States. Spanning approximately 190 miles (310 km) along a north–south axis, it is one of three primary Interstate Highways located entirely within New England; the other two are I-89 and I-91. The largest cities along the route are Boston, Massachusetts, and Manchester, New Hampshire; it also travels through the New Hampshire state capital of Concord.
The Atlantic City Expressway is a 44.19-mile (71.12 km), controlled-access toll road in the U.S. state of New Jersey, managed and operated by the South Jersey Transportation Authority (SJTA). It serves as an extension of the freeway part of Route 42 from Turnersville southeast to Atlantic City. It connects Philadelphia and the surrounding Delaware Valley with Atlantic City and other Jersey Shore resorts, and also serves other South Jersey communities, including Hammonton and Mays Landing. The expressway intersects many major roads, including Route 73 in Winslow Township, Route 54 in Hammonton, Route 50 in Hamilton Township, the Garden State Parkway in Egg Harbor Township, and U.S. Route 9 (US 9) in Pleasantville.
The Massachusetts Turnpike is a toll highway in the U.S. state of Massachusetts that is maintained by the Massachusetts Department of Transportation (MassDOT). The turnpike begins at the New York state line in West Stockbridge, linking with the Berkshire Connector portion of the New York State Thruway. Spanning 138 miles (222 km) along an east–west axis, the turnpike constitutes the Massachusetts section of Interstate 90 (I-90). The turnpike is the longest Interstate Highway in Massachusetts, while I-90 in full is the longest Interstate Highway in the United States.
State Route 267 is a primary state highway in the US state of Virginia. It consists of two end-to-end toll roads – the Dulles Toll Road and Dulles Greenway – as well as the non-tolled Dulles Access Road, which lies in the median of Dulles Toll Road and then extends east to Falls Church. The combined roadway provides a toll road for commuting and a free road for access to Washington Dulles International Airport. The three sections are operated and maintained by separate agencies: Dulles Toll Road and Dulles Access Road are maintained by the Metropolitan Washington Airports Authority (MWAA); the Dulles Greenway is owned by TRIP II, a limited partnership, but is maintained by Atlas Arteria, an Australian company which owns the majority stake in the partnership. The Dulles Access Road's median hosts the Silver Line of the Washington Metro between Reston and Falls Church.
E‑ZPass is an electronic toll collection system used on toll roads, toll bridges and toll tunnels in the Eastern United States, Midwestern United States, and Southern United States. The E-ZPass Interagency Group (IAG) consists of member agencies in several states, which use the same technology and allow travelers to use the same transponder on toll roads throughout the network. Since its creation in 1987, various independent systems that use the same technology have been folded into the E-ZPass system, including the I-PASS in Illinois and the NC Quick Pass in North Carolina. Negotiations are ongoing for nationwide interoperability in the United States.
The Silver Line is a system of bus routes in Boston and Chelsea, Massachusetts, operated by the Massachusetts Bay Transportation Authority (MBTA). It is operated as part of the MBTA bus system, but branded as bus rapid transit (BRT) as part of the MBTA subway system. Six routes are operated as part of two disconnected corridors. As of 2019, weekday ridership on the Silver Line was 39,000.
The New York State Thruway is a system of controlled-access highways spanning 569.83 miles (917.05 km) within the U.S. state of New York. It is operated by the New York State Thruway Authority (NYSTA), a New York State public-benefit corporation. The 496.00-mile (798.23 km) mainline is a toll road that extends from the New York City line at Yonkers to the Pennsylvania state line at Ripley by way of I-87 and I-90 through Albany, Syracuse, and Buffalo. According to the International Bridge, Tunnel and Turnpike Association, the Thruway is the fifth-busiest toll road in the United States.
Route 1A is a north–south state highway in Massachusetts. It is an alternate route to U.S. 1 with three signed sections and two unsigned sections where the highway is concurrent with its parent. Due to the reconfiguration of tunnel interchanges brought on by the completion of the Big Dig, Route 1A is discontinuous in the downtown Boston area. Vehicles entering Downtown Boston via the Sumner Tunnel must take I-93 north to the exit for Government Center and make a U-turn to access the entrance ramp to I-93 south and vice versa.
Interstate 376 (I-376) is a major auxiliary route of the Interstate Highway System in the US state of Pennsylvania, located within the Allegheny Plateau. It runs from I-80 near Sharon south and east to a junction with the Pennsylvania Turnpike in Monroeville, after having crossed the Pennsylvania Turnpike at an interchange in Big Beaver. The route serves Pittsburgh and its surrounding areas and is the main access road to Pittsburgh International Airport (PIT). Portions of the route are known as the Beaver Valley Expressway, Southern Expressway, and Airport Parkway. Within Allegheny County, the route runs along the majority of the Penn-Lincoln Parkway, known locally as Parkway West and Parkway East. It is currently the ninth-longest auxiliary Interstate route in the system and second only to I-476 within Pennsylvania.
The Lieutenant William F. Callahan Jr. Tunnel is one of four tunnels, and one of three road tunnels, beneath Boston Harbor in Boston, Massachusetts. It carries motor vehicles from the North End to Logan International Airport and Route 1A in East Boston. Ordinarily, this tunnel is only used to carry traffic out of the city, and with the completion of the Big Dig it only collects traffic from I-93 southbound and downtown Boston; northbound traffic uses the Ted Williams Tunnel. As of 2016, a toll of $1.50 is charged for non-commercial two-axle vehicles with a Massachusetts E-ZPass, while non-Massachusetts E-ZPass holders are charged $1.75. Vehicles without E-ZPass are charged $2.05 through MassDOT's Pay By Plate MA program. For residents of certain Boston ZIP codes, a discount is in effect using an E-ZPass transponder, costing $0.20.
The Sumner Tunnel is a road tunnel in Boston, Massachusetts, United States. It carries traffic under Boston Harbor in one direction, from Logan International Airport and Route 1A in East Boston. The tunnel originally deposited traffic at the west side of the North End, but with the completion of the Big Dig, it was modified to have two exits. One exit connects to I-93 northbound and downtown Boston near Haymarket Station. The other exit connects to Storrow Drive and Nashua St., connecting Cambridge via Route 28. Traffic headed for I-93 southbound and the Massachusetts Turnpike (I-90) westbound is normally routed to the Ted Williams Tunnel.
State Route 195 is a primary state highway in the U.S. state of Virginia. Known as the Downtown Expressway, the state highway runs 3.39 miles (5.46 km) from Interstate 195 (I-195) east to I-95 within the independent city of Richmond. SR 195 is a toll freeway that connects the West End of Richmond with Downtown Richmond. In conjunction with another toll road, SR 76, the state highway also connects the Southside suburbs of the metropolitan area with downtown. SR 195 has a mainline barrier toll plaza and ramp toll plazas at its interchanges with U.S. Route 1 and US 301 and with US 60, all of which accept E-ZPass. The state highway was constructed in the mid- to late 1970s and is maintained by the Richmond Metropolitan Authority.
Fast Lane was the original branding for the electronic toll collection system used on toll roads in Massachusetts, including the Massachusetts Turnpike, Sumner Tunnel, Ted Williams Tunnel, and Tobin Bridge. It was introduced in 1998, and later folded into the E-ZPass branding in 2012. Fast Lane transponders were fully interoperable with member agencies of the E-ZPass Interagency Group, however Fast Lane transponders afford users discounted tolls in some junctions that out-of-state users are not offered.
Interstate 476 (I-476) is a 132.1-mile (212.6 km) auxiliary Interstate Highway of I-76 in the US state of Pennsylvania. The highway runs from I-95 near Chester north to I-81 near Scranton, serving as the primary north–south Interstate corridor through eastern Pennsylvania. It consists of both the 20-mile (32 km) Mid-County Expressway, locally referred to as the "Blue Route", through the suburban Philadelphia-area counties of Delaware and Montgomery, and the tolled, 110.6-mile (178.0 km) Northeast Extension of the Pennsylvania Turnpike, which connects the Delaware Valley with the Lehigh Valley, the Pocono Mountains, and the Wyoming Valley to the north.
The Lane Cove Tunnel is an A$1.1 billion, 3.6 km twin-tunnel tollway in Sydney, Australia, which connects the M2 Motorway at North Ryde with the Gore Hill Freeway at Artarmon. It is owned by toll road operator Transurban and forms part of the M2 and the 110 km Sydney Orbital Network.
The Big Dig ceiling collapse occurred on July 10, 2006, when a concrete ceiling panel and debris weighing 26 short tons (24,000 kg) and measuring 20 by 40 feet fell in Boston's Fort Point Channel Tunnel. The panel fell on a car traveling on the two-lane ramp connecting northbound I-93 to eastbound I-90 in South Boston, killing a passenger and injuring the driver. Investigation and repair of the collapse caused a section of the Big Dig project to be closed for almost a full year, causing chronic traffic backups.
State Road 912 (SR 912), known along its entire length as Cline Avenue, is a freeway north of the combined Interstate 80/I-94/U.S. Route 6, and a local access road serving Griffith south of the Borman. The portion of Cline Avenue marked as SR 912 is 11.69 miles (18.81 km) long.
I-90 / Mass Pike 
