Initial development of prototype performance model for highway design
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Summary
This report details the initial development phase of the Interactive Highway Safety Design Model (IHSDM), a software suite commissioned by the Federal Highway Administration (FHWA) to analyze highway designs for safety issues and tradeoffs. The IHSDM is designed to integrate with Computer Aided Design and Drafting (CADD) tools, allowing engineers to perform interactive safety reviews during the design process. The system comprises five distinct modules: Policy Review, Design Consistency, Accident Analysis, Traffic Analysis, and Driver/Vehicle Analysis. The first three modules assess designs against established criteria and statistical databases, while the latter two utilize time-based simulations of traffic flow and single-vehicle behavior. The primary focus of this document is the establishment of requirements for the entire IHSDM system and the detailed design specifications for the Driver/Vehicle Module (DVM) and its core component, the Driver Performance Module (DPM). The DVM is structured as a time-based simulation model comprising several sub-modules: Geometrics, Random Processes, Vehicle Dynamics, Run-Time Data Processing, Post-Processing, and Monte-Carlo Analysis. The DPM specifically models driver behavior through sub-modules for Perception, Speed and Path Decision, Speed Control, and Path Control. The report defines the static and dynamic inputs, reference data, and outputs required for each component. It also reviews existing commercial CADD systems and candidate algorithms for steering and speed decision-making, such as optimal control and preview control models. To guide development and validation, the report identifies three specific driving scenarios representing different highway environments. It outlines a preliminary user interface design that facilitates scenario specification and result visualization within the CADD environment. Furthermore, the document identifies critical research requirements necessary to calibrate and validate the DPM. A proposed research program includes studies on speed selection for curve negotiation, speed control, and path control, addressing gaps in data regarding driver perception, attention sharing, and vehicle control under various conditions. The significance of this work lies in providing the foundational architecture and specifications for a comprehensive, integrated safety analysis tool. By linking safety simulation directly with highway design software, the IHSDM aims to enable iterative safety testing during the design phase rather than post-construction evaluation. This report serves as a technical blueprint for subsequent development, defining the data structures, functional requirements, and research needs necessary to create a validated prototype that can identify safety conflicts and support design tradeoff decisions.
Key finding
The report establishes detailed design specifications for the Driver/Vehicle Module and Driver Performance Module within the IHSDM framework, including requirements for perception, speed decision, speed control, and path control subcomponents.
Methodology
theoretical
Provenance
The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via bulk_ingest_rosap on 2026-05-23 (6 acquisition events logged).
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | rosap | — | — | 2 | 2026-05-23 |
| archive | success | — | — | — | 1 | 2026-05-23 |
| extract | success | cached | — | — | 2 | 2026-06-10 |
| clean | success | — | — | — | 1 | 2026-06-01 |
| chunk | success | — | — | — | 1 | 2026-06-01 |
| embed | success | — | — | — | 1 | 2026-06-02 |
| enrich | success | — | — | — | 1 | 2026-05-23 |
| promote | success | — | — | — | 1 | 2026-05-23 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 3 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 19 | 2026-06-11 |
| verify | success | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
Topics
Ranked by relevance to this paper. Hover a topic for its definition.
- perceptual countermeasures
- road geometry
- mental model of traffic
- situational awareness
- rail grade crossings
- speed choice
Information type
What kind of knowledge this paper contributes, grouped by family — independent of topic (what it is about) and method (how it was studied).
- Methodological Resource: tool software, dataset resource
- Theoretical Contribution: computational model