This bill significantly amends federal highway law to enhance the safety of vulnerable road users , such as bicyclists and pedestrians, by expanding the scope and funding mechanisms of the Highway Safety Improvement Program (HSIP). It introduces new categories of eligible projects, specifically including those focused on connecting existing active transportation infrastructure and initiatives designed to reduce safety risks for vulnerable road users through specific programs or strategies. A key provision allows the federal share for these newly eligible HSIP projects to be up to 100 percent , a substantial increase from typical funding levels. Furthermore, the bill permits funds from the HSIP to be credited towards the non-federal share of other projects if they incorporate Proven Safety Countermeasures for bicyclists or pedestrians, or if they address vulnerable road user risks identified in state strategic highway safety plans or various local safety plans. These eligible safety plans encompass a wide range of strategies, such as pedestrian or bicyclist safety plans, Complete Streets plans, and Vision Zero Action Plans. By increasing federal financial support and broadening project eligibility, the legislation aims to accelerate the implementation of critical safety improvements for active transportation across communities.