Still in effect as far as I know with no major issues, but not 100% sure.
Since 2010 Maine and Vermont truck pilot programs, which replaced Federal commercial-vehicle weight regulations with State limits on Interstate highways in those States. Public Law 111-117 also exempts Maine and Vermont from following Federal Bridge Formula B requirements mandated by Section 127 of Title 23, United States Code.
The DOT organized a team comprised of several Federal and State agencies to assess the impacts of heavier truck weights on Interstate bridges and pavements in Maine and Vermont. The team includes representatives from the Federal Highway Administration (FHWA), Federal Motor Carrier Safety Administration (FMCSA), Maine Department of Transportation (MaineDOT), Maine State Police, the Maine Bureau of Motor Vehicles, Vermont Agency of Transportation (VTrans), and Vermont Department of Motor Vehicles (Vermont DMV). The team specifically examined the following highways: Vermont I-89, I-91, and I-93; Maine I-95 from the Maine-New Hampshire border; Maine I-295 beginning at the turnpike south of Portsmouth and paralleling the turnpike until I-295 reconnects with the turnpike south of Augusta; Maine I-95 from the intersection of I-295 and the Maine Turnpike to the Canadian border near Houlton.
As allowed by the statute, Maine and Vermont have chosen to apply their State commercial-vehicle weight laws to the Interstate System. Maine now allows tractors with semitrailers up to 100,000 pounds gross vehicle weight on six axles and tandem axle weights up to a maximum of 46,000 pounds for many commodities on the non-tolled Interstate highways. Tolled Interstate highways and a portion of free Interstate between the southerly terminus of the Maine Turnpike and the New Hampshire border were already exempt. Maine did not choose to allow other non-federally compliant State truck weights onto the Interstate System. Vermont allows all trucks legal on its State highway system onto its Interstate highways, including those that weigh up to a maximum gross vehicle weight of 99,000 pounds on six axles, and trucks with tandem axles that weigh up to a maximum of 36,000 pounds plus a 10 percent additional weight allowance, which allows a total of 39,600 pounds.