(abbreviated '''I-93''') is an at
Interstate 91 .
Bolded cities are officially-designated
Control Cities for signs.
Interstate 93 is famous for being reconstructed by the
Big Dig , the most massive urban construction project in history. After this project was considered mostly complete in early
2005 , the section of Interstate passing through central
Boston, Massachusetts was largely underground. As of
April 19 , 2005, the tunnel is mostly complete, but greenification from the above-ground area that was removed because of the Dig has still to be completed. The entire project is to be completed in early-mid 2006. It is the most expensive road construction project in the USA.
No additional tolls have been placed upon use of Interstate 93, but as part of the
Big Dig the
Massachusetts Turnpike , a toll road and also
Interstate 90 while it runs through the state, was extended to
East Boston , the location of
Logan Airport . Northbound Interstate 93 now connects with the Mass Pike in South Bay for access to
South Boston and the airport. No toll is collected for traveling to the airport, but a toll of $3.00 is collected from motorists entering Interstate 90 at the airport.
- An 8 mile (13 km) section of I-93 through Franconia Notch State Park , called the in New Hampshire, was constructed as a Two-lane Freeway with a median divider. This was built as a compromise between the state's park department and highway officials. The speed limit on the Parkway is 45 mph (70 km/h). Originally, this section had its own exit number sequence, but they are now called Exit 34A, 34B, and 34C. This section is technically not part of I-93 and is not recognized by FHWA. I-93 is actually in two segments connected by the Franconia Notch Parkway. Signage formerly read "U.S. 3 TO I-93" in this area, but has been replaced by U.S. 3 and I-93 signage along the entire length of the Parkway. Indeed, an older brown overhead sign that read "TO I-93" has been overlaid with an I-93 shield.
- A section of the highway south of Boston, beginning south of the Savin Hill overpass and ending just before the junction with Route 3 , utilizes a " Zipper Lane ", in which a movable barrier carves out a High Occupancy Vehicle Lane in the non-peak side of the highway during Rush Hour .
- Hazardous cargoes are now prohibited from I-93 tunnels in Boston.
- I-93's original southern terminus was in Cambridge (just north of Boston) where it was to meet Interstate 695 . However, when that route was cancelled, and I-95 was cancelled and rerouted along Route 128 in the mid-1970s, I-93's route was extended an additional 18 miles down what was then just Route 3 from Boston to Braintree and then west along former Route 128 to its intersection with I-95 in Canton.
- I-93's route from Boston to Canton has also carried the U.S. Route 1 designation since 1989 . The US route's path was changed to assist truck traffic which was banned along much of the route's original path between Boston and I-95/Route 128 in Dedham.
- There are two major Park And Ride facilities off I-93, the Anderson Regional Transportation Center in Woburn, Massachusetts , at Exit 37C, and the Quincy Adams Red Line (MBTA) subway station, at Exit 7 in Quincy
