PATH

Incident Dispatching, Clearance and Delay

Hall, Randolph
2000

This report models response times and delays for highway incidents, according for spacing between interchanges and the time penalty for changing directions, enabling a response vehicle to reach an incident on the opposite side of the highway. A fundamental question in dispatching incident crews is whether to send the closest vehicle that is currently available or to wait for another to become available that is even closer. Waiting for a closer one is advantageous because service time is effectively reduced, adding to capacity and providing stability at higher levels of utilization. But...

Studies of Vehicle Collisions-A Documentation of the Simulation Codes: SMAC (Simulation Model of Automobile Collisions) Update 1

Chan, Ching-Yao
1999

This document describes part of the work conducted under MOU252 and MOU324, related to the studies of vehicle collisions in vehicle-following operations. This working paper is a detailed documentation of a computer program that is the core element of the simulation tools for vehicle collision dynamics. The program, SMAC (Simulation Model of Automobile Collisions), and its PC-platform version EDSMAC have been used extensively in recent work at PATH to investigate the consequences of vehicle collisions and the effects of vehicle-following parameters on collisions. A copy of the source codes...

Modernization of Center-to-Center Data Communication Standards: Sample Implementation Administration and User Guide

Peterson, Brian
2021

This document provides a guide to the reference sample application developed under the Traffic Management Data Dictionary (TMDD) modernization contract. The application provides a sample implementation of a SOAP implementation using the XML Schema Definition (XSD) and Web Service Description Language (WSDL) developed under the contract. In addition, it provides a sample implementation of a Kafka/JSON based messaging implementation. Both implementations utilize a sample set of data captured during the I-210 Connected Corridors contract. The application is intended for use by experienced...

User Perceived Benefits with Navigation Systems

Commeignes, Hervé
1991

It has often been assumed that travel time savings are only beneficial to the users of route guidance and navigation systems. In particular, absolute travel time savings have been emphasized, but there has been little interest in relative time savings between equipped and unequipped vehicles. Part 2 of this report investigates to what extent relative travel time savings decrease as the percentage of equipped vehicles increases.In order to compensate for a possible decrease in relative time savings, some other potential services that can be provided by navigation systems are identified in...

Daily Activity and Multimodal Travel Planner: Phase 1 Report

Kitamura, Ryuichi
Chen, Cynthia
1998

Travel constitutes an integral part of our daily life. Only by traveling are we able to engage in a variety of activities at different locations. Since the extension of our movement is restricted by the amount of time that is available and the speed with which we can move, it is important that our travel be efficiently organized such that the time resource can be best utilized to engage in activities in an efficient manner. One approach to achieving this is to choose less congested and faster routes. The use of in-vehicle advanced traveler information systems (ATIS) for this purpose has...

Traffic Measurement and Vehicle Classification with a Single Magnetic Sensor

Cheung, Sing Yiu
Coleri, Sinem
Dundar, Baris
Ganesh, Sumitra
Tan, Chin-Woo
Varaiya, Pravin
2004

Wireless magnetic sensor networks offer a very attractive, low-cost alternative to inductive loops for traffic measurement in freeways and at intersections. In addition to vehicle count, occupancy and speed, the sensors yield traffic information (such as vehicle classification) that cannot be obtained from loop data. Because such networks can be deployed in a very short time, they can also be used (and reused) for temporary traffic measurement. This paper reports the detection capabilities of magnetic sensors, based on two field experiments. The first experiment collected a two-hour trace...

California Transportation Management Centers Part 1. Assessment Of Existing Capabilities

Lo, Hong K.
Hall, Randolph W.
Windover, John R.
1993

Transportation Management Centers (TMCs) are focal points for monitoring and operating traffic management systems. As new technologies are developed through research in Intelligent-Vehicle- Highway Systems (IVHS), these TMCs will assume increasingly more importance as command and control centers for transportation operations. This study is aimed at developing visions for how the TMC of the future will exploit the capabilities of IVHS. Part 1 of this study, reported herein, is an assessment of existing TMC capabilities in the State of California. Part 2, to be reported later, will develop...

Assistive Devices and Services for the Disabled: Auditory Signage and the Accessible City for Blind or Vision-Impaired Travelers

Golledge, Reginald G.
Marston, James R.
Costanzo, C. Michael
1998

This project (MOU276) represents the first third of a longer project concerning making cities more accessible to some disabled groups by addressing some problems associated with the use of public transit. (The other two-thirds of the larger project is continued as MOU343). The disabled groups targeted in this project include the vision impaired or blind, those with low vision who have difficulty reading distant signs, those who are developmentally disabled, dyslexic, or otherwise print handicapped, those who do not read the English language, the illiterate, and small children. The blind or...

Relationships Among Urban Freeway Accidents, Traffic Flow, Weather and Lighting Conditions

Golob, Thomas F.
Recker, Wilfred W.
2001

Linear and nonlinear multivariate statistical analyses are applied to determine how the types of accidents that occur on heavily used freeways in Southern California are related to both the flow of traffic and weather and ambient lighting conditions. Traffic flow is measured in terms of time series of 30-second observations from inductive loop detectors in the vicinity of the accident prior to the time of its occurrence. Results indicate that the type of collision is strongly related to median traffic speed and to temporal variations in speed in the left and interior lanes. Hit-object...

Travinfo Field Operational Test Traveler Information Center (TIC) Study (technology Evaluation Element) Implementation Plan

Miller, Mark
Hall, Randolph
1995

TravInfo is a field operation test in the San Francisco Bay Area, designed to implement a centralized traveler information center to collect, integrate, and disseminate timely and accurate traveler information. The evaluation of TravInfo consists of four elements: institutional, traveler response, network performance, and technology. This document provides the implementation plan for the Traveler Information Center (TIC), part of the technology element, and also discusses how the TIC study will be coordinated with other evaluation elements.