A list of work products from SHRP 2 L02 that could be tested as part of L38. The list is organized on the basis of the nominal sequence in which the work products is or could be used in a travel time reliability monitoring system or project.
This paper examines a way to synthesize route travel time probability density functions (PDFs) on the basis of segment-level PDFs. Real-world data from I-5 in Sacramento, California, are employed. The first finding is that careful filtering is required to extract useful travel times from the raw
The objective of this project is to develop system designs for programs to monitor travel time reliability and to prepare a guidebook that practitioners and others can use to design, build, operate, and maintain such systems. This document presents the amplified work plan for the project.
This supplement contains five case studies that demonstrate approaches to travel time reliability monitoring described in the guidebook.
Related Artifacts: L02 - Supplement A - Monitoring System Architecture; L02 - Supplement B - Methodological Details; L02 - Supplement C - Ca
This white paper describes an acceptable process for creating distributions of travel times for a route from distributions of the segments that compose said route. It has long been generally accepted by experts in traffic flow analysis, including statisticians, that the variability of travel time
This paper aims to establish a point-queue based end-to-end travel time prediction method on a corridor with multiple merges and diverges. In a point-queue model, a link can be considered as two segments: the free-flow segment and the queuing segment. The accompanying spreadsheet and presentation
This supplement augments Chapter 3 by providing additional details about how to analyze travel time reliability for segments, routes, and networks.
Related Artifacts: L02 - Supplement A - Monitoring System Architecture; L02 - Supplement B - Methodological Details; L02 - Supple
The Project L02 Guide to Establishing Monitoring Programs for Travel Time Reliability describes how to develop and use a Travel Time Reliability Monitoring System (TTRMS). The guide also explains why such a system is useful; how it helps agencies do a better job of managing network performance; a
Database design usually takes the form of a schema, which formally describes the database structure, including the tables, their relationships, and constraints on data value types and lengths. Rather than defining an implementable schema, this chapter presents example tables that can store inform
Reliability is defined in this report as consistency of travel times for a particular trip. Travelers tend to estimate how long a trip will take based on parameters such as distance, time of day, and their own experience. Impacts to the transportation network that cause unexpected delays introduc
