Modifies provisions relating to memorial highway designation requirements and costs

HB 1596 updates Missouri's rules for naming highways or bridges to honor deceased individuals or events. Groups seeking such designations must now submit applications including a legislative sponsor, 100 supporting signatures, and a fee capped at the actual cost of constructing and maintaining the signs - submitted by November 1 annually. Special exemptions apply for fallen law enforcement, military personnel, and emergency responders, who avoid signature and fee requirements. Designations last 20 years with renewal options, and the state must post brief biographical links online for honorees named after August 2021.