Effectiveness of Different Approaches to Disseminating Traveler Information on Travel Time Reliability [supporting datasets]
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Summary
This document outlines the scope, objectives, and supporting datasets for SHRP 2 Project L14, titled "Traveler Information and Travel Time Reliability." The research addresses the need to improve urban mobility by effectively disseminating travel time reliability information to system users. Unlike real-time data that offers a current snapshot of conditions, reliability information provides static data on historic variations, enabling travelers to plan and budget for trips in advance. The project was motivated by the goal of helping individuals make informed travel decisions through better understanding of traffic variability. The project pursued six primary objectives: analyzing the current and future travel time reliability marketplace; determining the specific information requirements of travelers in complex metropolitan environments; identifying optimal communication methods for reliability data; quantifying the potential impact of improved communication on system performance; developing a standardized lexicon for reliability concepts; and creating prioritized strategies for state departments of transportation. To achieve these goals, the research team employed a multi-method experimental design involving human factors studies and laboratory experiments. Data collection included focus groups, computer surveys, and open-ended surveys to assess comprehension and preference for reliability terms. Additionally, the project conducted two laboratory studies: an original utility function study to assess the value participants placed on reliability information in simulated time-constrained trips, and an enhanced laboratory experiment designed to test three key hypotheses regarding the use and value of this information from the user’s perspective. The provided text serves as a repository description for the datasets generated during these studies. Specific data files include summarized post-survey results and filled-out spreadsheets from enhanced experiments conducted in Chicago, Washington DC, and Houston. The dataset also contains a summary table comparing results from the three human factors study methods regarding travel time reliability terminology. Furthermore, it includes SuperLab data from a multiple-choice survey addressing comprehension and preference, as well as open-ended survey data documented in the A3 report. The enhanced laboratory experiment data reflects the testing of hypotheses derived from the earlier human factors studies, while the original laboratory experiment data focuses on assessing the transition from unfamiliar to experienced commuter status when provided with reliability information. The significance of this work lies in its contribution to the development of guidance for public sector transportation agencies. By establishing a standardized lexicon and identifying effective dissemination strategies, the project aims to ensure that travel time reliability information is offered in a manner that is most useful to travelers. The findings support the creation of tools that help providers communicate reliability concepts clearly, ultimately aiming to improve transportation system reliability and user decision-making. The availability of these datasets allows for further analysis of how travelers interact with and value reliability information across different metropolitan contexts.
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 (8 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 | — | — | 6 | 2026-06-15 |
| 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 | 8 | 2026-06-15 |
| tag | success | vector_similarity | — | — | 24 | 2026-06-11 |
| verify | success | — | — | — | 1 | 2026-06-15 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-15; verification: verified.
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