The Almanac highlights Connecticut's statewide road system.

If you've ever wondered "does Connecticut have any SPUIs?" or "What's the widest highway in Connecticut?", you may find the answer here.

• Number of signed state routes: 215
• Number of U.S. routes: 7 (1, 1A, 5, 6, 7, 44, 202)
• Number of Interstate routes: 8 (84, 91, 95, 291, 384, 395, 684, 691)
• Duplicate numbers in different classes allowed? No; but for a short while I-87 and CT 87 coexisted
• Letter suffixes? Yes; 'A' in a few cases (more rare now than decades ago); a couple instances of 'B' for unsigned routes
• Letter-only routes? No. Routes A and B are signed along existing numbered routes, but are not in the highway log
• Number continuity across state lines? Yes; in all present cases where route is state-maintained on both sides
• Discontinuous signed routes? No; four routes have gaps in state maintenance, but are still continuously signed
• Highest signed state route: CT 372 (present and historical)
• Highest unsigned state route: SR 919 (present); SR 950 (historical)

• New England Interstate (1922 - 1931). Routes 8, 10, 12 and 32 remain from this system.
• State Highway - Primary 1923 - 1931). Number range: 101 - 299
• State Highway - Secondary (1923 - 1931). Number range: 300 - up
• Interstate (1956 - present)
• U. S. (1926 - present)
• State signed (1932 - present). Number range: 2 - 399
• State unsigned (193x - 1963). Number range: 401-999
• Special Service Routes (SSR) (1963 - present). Number range: 401-499
• State Roads (SR) (1963 - present). Number range: 501-999
• County routes: none
• Business routes: Rare; reportedly a BUS I-84 in Newtown, years ago
• Other special routes: Rare; historical "LOOP 2" circa 1972 in Marlborough

• Total state-maintained route mileage: 3,732.8
• Number of interchanges: about 400

• Suicide lanes: none
• Center lanes for opposing left turns: none known
• Reversible lanes: Asylum Avenue, Hartford; possible others
• Triple left turn lanes: none known
• Rotaries: a few, as at CT 79/80, CT 2/184.
• Roundabouts: a few
• Jughandles: at least 4 (CT 71 at I-84 EB, CT 4 at SR 508, SSR 401 at SSR 403, US 5/CT 15 at CT 9)
• Michigan lefts: none
• Texas U-Turns: none
• One-way Frontage Roads: I-95 in Waterford and New London
• Super 2: CT 78; stretch of US 6 east of I-395. CT 2A was formerly a Super 2, but was widened in 1996.
• HOV Lanes: I-84, East Hartford to Vernon; and I-91, Hartford to Windsor Locks. Both facilities are separated from main lanes and have their own entrances and exits.
• Zipper lanes: none
• Double-decking: on I-84 in Waterbury (over CT 8); and on CT 8 just south of I-84.
• Opposing roadway crossover: none today. But I-84 in Waterbury east of CT 8 did this until about 1973.
• One-lane underpasses: a few, notably CT 150/71 in Wallingford, under a railway.
• Collector-distributor (C/D) lanes: I-84 at I-291 and I-384 complex, Manchester

• Full cloverleaf: Three (CT 15 at CT 34; CT 15 at old US 7; I-95 at US 1, Milford)
• Stack: One (I-84 at CT 9; built for I-291; partially unused)
• Single-point urban interchange (SPUI): One open (CT 15 at CT 111); two planned (I-84 exit 43, US 5/CT 15 at CT 175)
• "Volleyball": none; one was planned at I-291 and Berlin Tpke
• Left exits: Funny you should ask. About 35 of these statewide.
• Ramp meters: none known; one was tested at CT 17 onramp to CT 9 NB, Middletown

• Longest state route, in state: CT 15 (83.53 miles)
  
• Longest state route, counting out-of-state continuations: CT 10 (about 262 miles)
  
• Shortest signed state route: CT 125, 1.24 miles
  
• Shortest unsigned state route: SR 910, 0.04 miles
  
• Widest road: 12 lanes (includes 2 HOV), I-84, between CT 15 and I-384, East Hartford
• Most numerous overlap (aka "multiplex"): Four (I-84 and US 6/7/202, Danbury)
• Highest exit number: 100 (present), 106 (historical)

• Covered Bridges: three standing: Bulls Bridge; Cornwall (CT 128); and Colchester (alongside CT 16, pedestrian access only)
• Suspension Bridges: none
• Cable-stayed bridges: one planned for I-95 in New Haven over the Quinnipiac River

• CT 160 Ferry, Rocky Hill - Glastonbury Oldest continously operating ferry in US (if you don't count winters)
• CT 148 Ferry, Chester - Hadlyme

• Connecticut Turnpike (I-95, I-395, SSR 695): from opening date (1958) to 1985
• Merritt Parkway (CT 15): from 1939 to 1988
• Wilbur Cross Parkway (CT 15): from opening dates to 1985
• Bissell Bridge (CT 291): from c. 1957 to c. 1985
• Bulkeley Bridge (I-84): dates unknown
• Founders Bridge (CT 2): from c. 1957 to c. 1962
• Charter Oak Bridge (CT 15): from opening date (1942) to April 28, 1989
• Putnam Bridge (CT 3): from opening date (1958) to c. 1987
• Baldwin Bridge (I-95): tolls removed 1968
• Mohegan - Pequot Bridge (CT 2A): Dec. 1, 1967 (bridge opening) to Sept. 30, 1980
• Gold Star Bridge (US 1, now I-95): tolls removed 1963

• "Toll Revenue Jumps 46.5% in 10 Years." Hartford Courant, Sept. 13, 1973.