Specifications include, but are not limited to: Task 1. Conduct a literature review of relevant research for safety performance and effectiveness of safety treatments and technologies within shared railway-highway interfaces, including human factors research. The review shall include published and unpublished research conducted through the NCHRP; FHWA; and other national, international, state, and pooled-fund sponsored sources. Task 2. Conduct a critical analysis and synthesis of the literature review results and identify knowledge gaps and opportunities. These gaps must be addressed in the final deliverables as budget permits or the recommended future research. Document findings from Tasks 1 and 2 in a technical memorandum. Task 3. Develop a survey for state DOTs, other agencies, and authorities. The draft survey and distribution list must be reviewed by the panel and approved by NCHRP before distribution. The survey shall, at a minimum, Address federal, state, and local guidelines and practices; Identify any perceived gaps in existing guidelines; and Identify types and locations of shared facilities with examples. Task 4. Develop a methodology to achieve the project objective to be executed in Phase II. At a minimum, the methodology shall address Railway–highway interfaces for freight and passenger services; Common geometric and operational features of railway-highway interfaces; Safety of vulnerable road users; Regional and land use considerations, including urban and rural area types; Cases that include two or more rail line types or other multimodal facility types at a railway-highway interfaces (i.e., freight and passenger rail); Commonly used safety countermeasures and strategies;