Due to the increasing use of the highway and the dangerous conditions at the interchanges with the Capital Beltway and US 301, the highway was reconstructed to Interstate standards between 1990 and 1995 between the Capital Beltway and MD 70 in Annapolis. Funding for the project was released from the cancellation of Interstate Highway segments within Baltimore. Originally, planners intended to designate the reconstructed highway as I-68, but with the completion of the National Freeway in far western Maryland in 1991, the Maryland State Highway Administration chose instead to designate that route as I-68, leaving the John Hanson Highway to be designated as I-595.