I-93/Central Artery: Boston 08/10 I-93/Central Artery: Boston Page 1 of 2 Southampton Street to O’Neill Tunnel South Portal Southbound Northbound Tunnel Portal Tunnel Portal Broadway/ Frontage Road 12100 On-Ramp I-90 EB and WB 11732 On-Ramp Albany Street 12126 On-Ramp Mass. Ave./ Frontage Road 12098 HOV On-Ramp Exit 18 12127 Mass. Ave. Andrew Square HOV (Logan Airport) Off-Ramp 12091 HOV Mass. Ave. Exit 20 Connector Logan Airport Worcester 12081 South Station HOV 12131 On-Ramp Southbound Haul Road Southampton Street Northbound Exit 18 Mass. Ave./ Roxbury 12080 Frontage Road Off-Ramp South Bay Center Interchange 16 #81 Frontage Road Southampton Street 12132 Southampton St On-Ramp Exit 16 Southampton Street 12079 Andrew Square To Boston Street #8110 I-93/Central Artery: Boston Page 2 of 2 O’Neill Tunnel South Portal to Storrow Drive Zakim Bridge Storrow Drive O’Neill Tunnel North Portal 12110 Leverett Circle On-Ramp Exit 26 12109 Southbound Storrow Drive Ramp from Government Center 12108 to I-93 North Exit 24B-A Ramp from 12111 Route 1A/Airport Sumner Tunnel 12105 Government Center to Storrow Drive Ramp from Exit 24 B Sumner Tunnel 12106 12112 Route 1A to I-93 North Logan Airport Ramp from Sumner Tunnel Exit 24 A 12107 to Local 12113 Government Center Sumner Tunnel Government Center 12114 On-Ramp Northern Avenue Exit 23 Essex Street 12104 12115 Purchase Street On-Ramp South Station Northern Avenue Component of 12103 West Barrel Essex/ Northern 12116 Off-Ramp On-Ramp Essex Street Component of Exit 22 12102 Essex/Northern 12117 Summer Street On-Ramp Exit 23 Government 12101 Center Congress Street 12118 On-Ramp I-90 Eastbound Lincoln Street and Westbound 11728 12124 On-Ramp On-Ramp I-90 West 12119 Turnpike Off-Ramp O’Neill Tunnel South Portal West Barrel 12125 On-Ramp Northbound.