Highways, Roads and Bridges - As enacted, requires TACIR to study sustainable funding sources that meet this state's future transportation infrastructure needs and submit its recommendations. - Amends TCA Title 4; Title 9; Title 54 and Title 55.

SB 703 requires Tennessee's TACIR (Tennessee Advisory Commission on Intergovernmental Relations) to study sustainable transportation funding sources to address declining gas tax revenue from fuel-efficient vehicles and rising infrastructure costs. The study must examine the state's road and bridge needs, identify long-term revenue options beyond current gas taxes, and analyze funding models from at least three other states. TACIR must submit its recommendations, including potential legislation, to key legislative committees by January 15, 2026, using existing resources. This bill directly affects TACIR and state agencies responsible for transportation funding, aiming to inform future policy decisions.