Editing Interstate 97 (section)

===Interstate designation and construction===
[[File:2019-05-21 11 48 12 View north along Interstate 97 (Glen Burnie Bypass) at Exit 14 (Maryland State Route 100, Ellicott City, Gibson Island) on the edge of Severn and Glen Burnie in Anne Arundel County, Maryland.jpg|thumb|right|I-97 northbound at the MD&nbsp;100 interchange in Glen Burnie]]
Despite the existence or upcoming construction of two divided highway corridors between Baltimore and Annapolis, a freeway connecting I-695 and US&nbsp;50 was proposed as early as 1956 in the form of the Arundel Expressway, which would relieve congestion on MD&nbsp;2.<ref name="Baltimore Sun Route 10"/> The portion of the Arundel Expressway that is today MD&nbsp;10 was constructed from I-695 to MD&nbsp;648 in Pasadena between 1970 and 1978.<ref name="Milestones"/> MD&nbsp;10 was proposed to continue south of Pasadena as a toll road to US&nbsp;50, but the section of the freeway south of MD&nbsp;100 was removed from state plans by 1975.<ref name="Baltimore Sun Photo"/><ref name="1975 map"/> MD&nbsp;10 was completed to its present end in Pasadena in 1991.<ref name="Baltimore Sun Route 10"/> The state of Maryland unsuccessfully petitioned the [[Federal Highway Administration]] for an Interstate designation for a Baltimore–Annapolis freeway after passage of the [[Federal-Aid Highway Act of 1968]]. However, the state was successful in obtaining Interstate mileage for the Baltimore–Annapolis corridor through the 1968 Howard–Cramer amendment, which provided for minor adjustments to the Interstate System if no additional costs were incurred.<ref name="FHWA Interstate System Part I"/> Much of the mileage of what became I-97 was reallocated from canceled Interstate Highways in Baltimore and the [[Washington, D.C.]] area.<ref name="FHWA Interstate System Part V"/>

With Interstate funding assured, MDSHA commissioned the Baltimore–Annapolis Transportation Corridor Study in 1973 to figure out, among other things, the best route for the Baltimore–Annapolis Interstate.<ref name="Baltimore Sun Dorsey"/> The study discovered a western route following the MD&nbsp;3 and MD&nbsp;178 corridors would be less disruptive and require fewer acquisitions of homes and businesses compared to an extension of the Arundel Expressway south along the MD&nbsp;2 corridor.<ref name="BATCS"/> In June 1979, MDSHA announced plans for I-97.<ref name="Milestones"/> The original route numbering plan, which was approved by the [[American Association of State Highway and Transportation Officials]] (AASHTO) at its November 1975 meeting, was for I-97 to include its current route plus US&nbsp;50 from Parole west to I-95 (Capital Beltway). That proposal included two auxiliary Interstate highways. I-197 would follow US&nbsp;50/US&nbsp;301 east from I-97 to just west of the Severn River.<ref name="AASHTO November 1975"/> I-297 would follow MD&nbsp;3 between a pair of intersections with I-97 in Millersville and Bowie.<ref name="FHWA Interstate System Part V"/><ref name="AASHTO November 1975"/> AASHTO rescinded its approval of the 1975 plan at its June 1981 meeting, then approved what was essentially the original 1975 plan at its June 1982 meeting.<ref name="AASHTO June 1981"/><ref name="AASHTO June 1982"/> The east–west segment of I-97 and I-197 was replaced by I-68.<ref name="AASHTO June 1982"/> I-297 was withdrawn by request of the state of Maryland in 1983.<ref name="FHWA Interstate System Part V"/> The 1982 concept of I-68 became unsigned I-595 and I-68 was applied to the [[National Freeway]] in [[Western Maryland]] in 1991 after AASHTO approved the new designations at its June 1989 meeting.<ref name="FHWA Interstate System Part V"/><ref name="AASHTO June 1989"/>

The first portion of I-97 proper to be constructed was the section south of Millersville, which was placed under construction in three sections in March 1985.<ref name="logbook 3p13"/><ref name="Baltimore Sun Cade Dedication"/> The first section of the highway, from US&nbsp;50/US&nbsp;301 to Millersville Road west of the MD&nbsp;178 interchange, opened in December 1987.<ref name="Milestones"/> Construction of I-97 from Millersville Road to the intersection of MD&nbsp;3 and MD&nbsp;178 at Dorrs Corner started in July 1987.<ref name="logbook 3p13"/> The Interstate through Millersville opened in April 1989.<ref name="Milestones"/> The interchange at I-97's southern terminus was originally constructed as a partial interchange, with I-97 tying into what are now the [[collector–distributor lanes]] of US&nbsp;50 and US&nbsp;301.<ref name="1989 map"/><ref name="USGS South River 1993"/> The ramps from eastbound US&nbsp;50/US&nbsp;301 to I-97 and from I-97 to the westbound US Routes were added during the reconstruction of US&nbsp;50/US&nbsp;301 in 1992 and 1993.<ref name="logbook 3p15"/><ref name="1993 map"/>