Interstate 189 and the unopened Southern Connector between U.S. 7 (Shelburne Road) and Home Avenue in South Burlington.
Interstate 189 is the lone branch route for I-89. The freeway spur connects U.S. 7 (Shelburne Road) with Interstate 89, Dorsett Street and Kennedy Drive north to Burlington International Airport (BTV).
The Vermont Department of Highways initially suggested to the American Association of State Highway Officials (AASHO) on April 15, 1958 that the spur into Burlington be numbered SP 89. A map sent to AASHO showed a spur drawn west from I-89 near Patchen Road west to U.S. 2/7 (Riverside Avenue) near the Winooski River. A subsequent letter to AASHO on April 18, 1958 suggested that the spur be unnumbered:
For route numbering purposes, so far as motorists are concerned, we do not think it should have a separate number. Traffic destined for the interstate should be guided by trail blazer assemblies, while traffic leaving the interstate would follow guide signs into the city. We realize, of course, that a somewhat different situation would exist in connection with loops and through routes.
Per instructions from AASHO, Vermont submitted Interstate 189 as the proposed numbering on August 29, 1958. AASHO approved it on November 10, 1958.
Interstate 189 opened to traffic from I-89 west to U.S. 7 on November 29, 1962. The freeway was originally planned to connect with the Burlington Belt Line Highway as part of the 1965 Greater Burlington Urban Area Highway Plan. Serving industrial areas and Downtown Burlington, the Belt Line was proposed south from Burlington to U.S. 7 and north along the Lake Champlain waterfront. Northern reaches of the expressway extended along Winooksi Valley Parkway (Vermont 127) toward the Colchester town line. Despite right of way acquisition already made, plans for the expressway succumbed to adamant neighborhood opposition and a resurgence in the city economy. They were subsequently cancelled.