I-691

Interstate 691
Henry D. Altobello Highway
I-691 highlighted in red
Route information
Auxiliary route of I-91
Maintained by ConnDOT
Length	8.92 mi (14.36 km)
Existed	1988 (completed) – present
Major junctions
West end	I-84 at the Southington-Cheshire line
	US 5 / Route 15 in Meriden
East end	I-91 / Route 66 in Meriden
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future Routes in Connecticut Interstate U.S. State SSR SR ← I-684 US 1 →

Interstate 691 (abbreviated I-691) is a portion of the Interstate Highway System in Connecticut beginning at Interstate 91 in Meriden and ending at Interstate 84 near the Cheshire-Southington town line. It is 8.92 miles (14.36 km) in length, including 0.54 miles (0.87 km) of the exit ramp to the merge with westbound I-84.

I-691 is also known as the Henry D. Altobello Highway for its entire length.

I-691 is the main east–west highway of the city of Meriden. The freeway actually begins in Middlefield as Route 66, technically becoming I-691 at the junction with I-91 (Exit 11). However, westbound signage indicates I-691 begins at the start of the freeway (just west of Exit 13), while eastbound signage shows I-691 ending at the Route 15 interchange (at eastbound Exit 10 about 0.5 miles (0.80 km) west of the interchange with I-91). To go from I-91 northbound to I-691 westbound (or from I-691 eastbound to I-91 southbound), one must actually use Route 15. Exit 9 westbound provides access to Route 15 North.