This bill, titled the Sarah Debbink Langenkamp Active Transportation Safety Act, significantly amends the Highway Safety Improvement Program to enhance safety for bicyclists and pedestrians. It expands the definition of a highway safety improvement project to specifically include connecting existing bicyclist or pedestrian infrastructure segments and reducing safety risks for vulnerable road users through targeted strategies. A key provision allows for an increased federal share, potentially up to 100 percent , for these newly defined active transportation safety projects funded through the Highway Safety Improvement Program. The bill also introduces flexible financing for certain projects, permitting the non-Federal share to be calculated on a project, multiple-project, or program basis, and allowing individual projects to receive up to 100 percent federal funding. Additionally, it enables Highway Safety Improvement Program funds to be credited towards the non-Federal share of projects that incorporate Proven Safety Countermeasures for bicyclists or pedestrians, particularly if the state's strategic highway safety plan addresses vulnerable road users or the project is identified through specific safety planning processes. This legislation aims to incentivize comprehensive safety improvements for active transportation by providing greater financial flexibility and support for critical infrastructure and risk reduction efforts.