Roads/Highways

Freeway Detector Data Analysis For Simulation Of The Santa Monica Freeway - Summary Report

Bloomberg, Loren D.
May, Adolf D.
1993

The objective of this study is to collect, organize, analyze, and summarize available detector data for the Santa Monica Freeway. The primary goal is to develop on/off ramp counts as input to a synthetic origin/destination model; mainline freeways counts are also needed. Strategies for synthesizing data from stations where current detector data are unavailable are also considered. This report is a revised version of UCB-ITS-PWP-93-1 (PATH Database record #4079)

Advanced Simulation Tools for Freeway Corridor Management

Gardes, Yonnel;
Tang, Eric
Ma, Jingtao
May, Adolf D.
2003

As part of the California PATH program, the Paramics microscopic traffic simulation model was applied to the I-580 freeway-arterial corridor. The main purposes of the project were two-fold:- Develop the expertise and transfer the knowledge required in calibrating a large-scale freeway corridor with Paramics;- Prepare a calibrated model for the I-580 corridor that could be used to address operational questions, evaluate potential improvement alternatives and provide input to the decision-making process.In agreement with Caltrans District 4 and Headquarters, the study focused on the...

Systematic Design for Roadway Interfaces with Applications to Automated Highways

Hall, Randolph
2000

This report provides interim results on the design of interfaces between automated highways and conventional street systems. The purpose here is to identify the strategic issues in interface design, and to provide preliminary analysis on just one of these issues (separation between highway entrance and exits). Future research will explore a full set of strategic issues in greater depth. The central concept explored in this report is how to design a roadway system that comprises multiple layers, some of which are designed for the purpose of accessibility, and others of which are designed...

Development Testing And Evaluation Of Advanced Techniques For Freeway Incident Detection

Ritchie, Stephen G.
Abdulhai, Baher
1997

In this research, the authors introduce and define a universal incident detection framework that is capable of fulfilling all components of a set of recognized needs. An algorithm is presented that has the potential to fulfill the defined universality requirements. It is a modified form of a probabilistic neural network (PNN) that utilizes the concept of statistical distance. The first part of the report presents a definition of the attributes and capabilities that a potentially universal freeway incident detection framework should possess. The second part discusses the training and...

An Assessment of Bus Rapid Transit Opportunities in the San Francisco Bay Area

Miller, Mark A.
White, Dustin
2004

This report documents a continuing assessment of bus rapid transit opportunities in the San Francisco Bay Area. In this study we are focusing on bus transit routes that partially travel on California state routes, whether arterial roadways or freeways. A primary component of this project is to consider the inter-connectivity and regional aspects of bus rapid transit systems deployment in the San Francisco Bay Area region. Considering state routes will help identify more regional opportunities for innovative types of partnerships to help address unmet public transit service needs across...

Fuzzy Logic Control For Lane Change Maneuvers In Lateral Vehicle Guidance

Hessburg, Thomas
Tomizuka, Masayoshi
1995

This paper investigates the feasibility of a fuzzy logic control (FLC) algorithm for lateral control in a lane change maneuver in an automated highway system (AHS). The lane change maneuver takes the vehicle from lane following control in one lane to lane following control in an adjacent lane. A lateral accelerometer is the only sensor used for feedback during the maneuver. The rules of the FLC are developed based on human driving experience.

How the Reconstruction of I-880 Affected Travel Behavior

Dahlgren, Joy
2001

One of the concerns that people have about expanding highway capacity is that this will motivate more people to travel, so that the highway will soon become as congested as before. This is also a concern with automated vehicles, which would have the effect of increasing capacity. This so-called induced travel has been a subject of much debate and study in recent years. One of the problems confounding studies of this subject has been that capacity increases are generally motivated by recent or expected development, which generates increased travel and can even increase per capita travel if...

Berkeley Highway Lab Videl Data Collection System

Chen, Chao
Lyddy, Daniel
Dundar, Baris
2004

The goal of this project is to replace the existing analog video collection system on the roof of Pacific Park Plaza (PPP) with a digital one. This video collection system is part of the Berkeley Highway Laboratory (BHL) testbed. It records video of traffic on a continuous one-kilometer section of Interstate 80 (I-80) near Emeryville, CA. This section of I-80 features on-ramps, off-ramps, and weaving zones. The video of interactions between vehicles can be fed to a machine-vision system, which generates vehicle trajectories to be used in a variety of traffic studies. The video itself can...

Short Term Freeway Traffic Flow Prediction Using Genetically-Optimized Time-Delay-Based Neural Networks

Abdulhai, Baher
Porwal, Himanshu
Recker, Will
1999

Proper prediction of traffic flow parameters is an essential component of any proactive traffic control system and one of the pillars of advanced management of dynamic traffic networks. In this paper, we present a new short term traffic flow prediction system based on an advanced Time Delay Neural Network (TDNN) model, the structure of which is optimized using a Genetic Algorithm (GA). After presentation of the model's development, its performance is validated using both simulated and real traffic flow data obtained from the California Testbed in Orange County, California. The model...

LANE-OPT Users Manual Version 1.0

Lotspeich, David
Hall, Randolph W.
1996

This document is the user manual for LANE-OPT. LANE-OPT is a linear program based software package that optimally assigns traffic to lanes on an automated highway. The program is based on a workload model, such that each lane/segment has a fixed capacity than can be allocated among: (1) straight traffic, (2) lane changes into the lane, (3) lane changes out from the lane, and (4) lane changes that pass through the lane. Each of these four movements produces a user-specified workload. The computer program models the highway as a multi-commodity flow network, where commodities represent...