This brochure describes the obligations and benefits of the Triborough Bridge and Tunnel Authority (TBTA) 20-Year/Age 50 Retirement Plan for Tier 6 members (6TB-20). This plan allows participants to retire with 20 years of Credited Service (all service) and at least age 50. The 6TB-20 plan is available ONLY to those employed in a TBTA Eligible Position.