Connecticut commercial vehicle weight limits follow the federal Interstate standard of 80,000 lbs gross, 22,400 lbs per single axle, and 36,000 lbs per tandem axle group. The federal bridge formula (23 U.S.C. 127) applies on all routes. Connecticut imposes spring weight restrictions on state routes during spring thaw, typically March through April. Posted routes have reduced weight limits to protect road surfaces from freeze-thaw damage. Check CTDOT for current restricted routes before routing on state highways. Oversize and overweight permits are available from CT DOT for loads exceeding standard limits. Verify current road-specific postings with the Connecticut DOT before routing heavy loads.
Connecticut imposes spring weight restrictions on state routes during spring thaw, typically March through April. Posted routes have reduced weight limits to protect road surfaces from freeze-thaw damage. Check CTDOT for current restricted routes before routing on state highways.
Check current restrictions at CT DOT →The federal bridge formula limits the weight on any group of axles based on the distance between the outermost axles in the group. It applies in Connecticut on all routes where federal standards apply.
W = maximum weight in lbs · L = axle spacing in feet · N = number of axles
CTDOT issues oversize/overweight permits through its Permits and Agreements office. Single-trip permits for one-time movements exceeding legal limits. Annual permits for qualifying routine operations. Superload permits for extreme weights require engineering review and pre-approved routing. Connecticut's dense urban road network and low bridge clearances (especially in older cities) require careful routing review for any oversized load.
Apply for Connecticut OS/OW Permit →Connecticut's maximum gross vehicle weight is 80,000 lbs on Interstate highways — matching the federal standard. However, Connecticut's single axle limit (22,400 lbs) and tandem axle limit (36,000 lbs) are higher than federal standards, allowing operators to carry more weight per axle configuration while staying under the gross limit.
Yes. Connecticut allows 22,400 lbs on a single axle (vs. federal 20,000 lbs) and 36,000 lbs on a tandem axle (vs. federal 34,000 lbs). This means operators can legally carry heavier axle loads within the 80,000 lb gross limit in Connecticut than in most other states — a meaningful payload advantage for distribution operations.
Yes. Connecticut imposes spring weight restrictions on state routes typically in March and April during spring thaw. Posted road signs indicate reduced weight limits on affected routes. Interstate highways are generally not subject to spring restrictions. Check CTDOT for currently restricted routes before routing heavy loads on state highways during this period.
The Merritt Parkway (Route 15) and the Wilbur Cross Parkway are strictly prohibited to commercial trucks and all vehicles over 7 feet 6 inches in width. These parkways have overpasses as low as 10 feet clearance in some locations — truck strikes on the Merritt Parkway occur regularly. Use I-95, I-91, I-84, or Route 1 as alternatives. Always use commercial truck GPS routing in Connecticut.
CTDOT issues oversize/overweight permits through its Permits and Agreements office at portal.ct.gov/DOT. Apply for single-trip or annual permits as appropriate. Superload permits for extreme weights require engineering review. Connecticut's urban environment and older infrastructure mean routing review is critical — CTDOT staff can advise on safe routes for oversized loads through the state's constrained highway network.
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Disclaimer
The information on this page is compiled from publicly available government sources and is provided for general informational purposes only. TruckRadar is an independent search engine — we are not affiliated with any government agency and this content does not constitute legal or compliance advice. Regulations change frequently; always verify current requirements directly with the official source before making compliance decisions.
Official source: Connecticut CT Department of TransportationLast reviewed: 2026-04