AECOM Project Overview Presentation - I-93 Tri-Town Interchange ...

Recent History• Interstate 93 Corridor Study identified need for new interchange• Interchange Justification Report (IJR) prepared for FHWA• FHWA gives tentative approval for break-inin-access (newinterchange)• Environmental studies and conceptual design (based on agencyand public comment) underway

Constraints &OpportunitiesMapping

Alternative 4− Access to South Street− Access to west sideparcels− Inconsistent with accessprovisions in zoningoverlay district

Alternative 9− Does not provide FHWArequired access to localroadway system− Too “circuitous”according to FHWA

Single Point UrbanInterchange (SPUI)− New concept to consider− Exact layout and locationto be determined− Reduces interchangefootprint− Requires additionalstructural elements andwider bridge deck toaccommodate opposingleft turn movements

Single Point Urban Interchange Concept

Tight DiamondInterchange− New concept toconsider− Exact layout andlocation to bedetermined− Reduces interchangefootprint− Traditional ramp termini(as opposed to SPUI)

Tight Diamond Concept

Project Schedule

Economic Impact Analysis− FXM Associates is part of our consultant team asspecialists in determining the economic impacts ofhighway projects− Frank Mahady will say a few words regarding FXM’soverall approach and the purpose of today’s meeting