Roads/Highways

Section Related Measures of Traffic System Performance: Final Report

Ritchie, Stephen
Sun, Carlos
1998

This project describes a new set of advanced traffic surveillance techniques that are based on inductive vehicle waveforms and pattern recognition technology. Focus is on demonstrating and evaluating a new method for obtaining true selection related performance measures, such as section travel time and section density, for freeways. The report also discusses methods for the measurement of lane-by-lane traffic movement and specific origin/destination demands.

Assessing Automated Speed Enforcement in California

Chan, Ching-Yao
Li, Kang
Lee, Joon-Ho
2010

Speeding is known to be related to a significant portion of highway collisions. As part of the efforts to seek safety improvements of the California highway network, the California Department of Transportation (Caltrans) is exploring the implementation issues of automated speed enforcement (ASE). This report provides an overview of Task Order 6212 undertaken by California PATH to assess various issues associated with ASE systems.An ASE system designed for use in work zones was acquired and tested in several field experimental sites, along with several other commercially-off-the-shelf...

ITS Band Roadside to Vehicle Communications in a Highway Setting

Dickey, Susan
Dulmage, Jared
Huang, Ching-Ling
Sengupta, Raja
2010

Researchers investigated the testing and evaluation of radio and communication protocol standards for the 5.9 GHz spectrum that has been approved by the Federal Communications Commission for exclusive transportation use. This spectrum allocation is intended for use as Dedicated Short Range Communications (DSRC) in the context of high-value Intelligent Transportation Systems (ITS) applications. In this report, we summarize the Wireless Access in a Vehicular Environment (WAVE) standardization effort for 5.9 GHz DSRC, its current status, and related issues of the IEEE 802.11p and IEEE 1609...

Evaluation of the Anaheim Advanced Traffic Control System Field Operational Test: Executive Summary

McNally, M. G.
Moore, James E., II
MacCarley, C. Arthur
Jayakrishnan, R.
1999

This Executive Summary provides an overview of the technical and institutional issues associated with the evaluation of the federally-sponsored Anaheim Advanced Traffic Control System Field Operations Test. The primary FOT objective was the implementation and performance evaluation of adaptive traffic signal control technologies including an existing second generation approach, SCOOT, and a 1.5 generation control (1.5GC) approach under development. Also selected for implementation was a video traffic detection system (VTDS).The SCOOT evaluation was defined relative to existing, first...

Methods for Identifying High Collision Concentration Locations for Potential Safety Improvements

Geyer, Judy
Lankina, Elena
Chan, Ching-Yao
Ragland, David
Pham, Trinh
Sharafsaleh, Ashkan
2008

The California Department of Transportation (Caltrans) uses Table C and related documents to identify and to investigate locations within the state highway system where a relatively large number of collisions occur. In earlier years, a task force evaluated the process of generating and using these reports and found that there was much room for improvements. A list of recommendations was made. The efforts undertaken within this project is part of the effort to make the process of safety investigations and improvements more efficient and productive. This report summarizes the work carried...

Safety and Capacity Analysis of Automated and Manual Highway Systems

Carbaugh, Jason
Godbole, Datta N.
Sengupta, Raja
1999

This paper compares safety of automated and manual highway systems with respect to result- ing rear-end collision frequency and severity. The results show that automated driving is safer than the most alert manual drivers, at similar speeds and capacities. We also present a detailed safety-capacity tradeo study for four di erent Automated Highway System concepts that di er in their information structure and separation policy.

HOT Lane Simulation Tools

Horowitz, Roberto
Kurzhanskiy, Alex A.
Wright, Mathew
2018

This report describes the simulation model and software for freeway corridors with High-Occupancy Vehicle (HOV) and High-Occupancy or Tolled (HOT) lanes, and the model calibration methodology.

Safe Operation of Automated Vehicles in Intersections

Germbek, Offer
Kurzhanskiy, Alex A.
Medury, Aditya
Varaiya, Pravin
Yu, Mengqiao
Siddiqui, Asfand
2018

This report describes the technology needed for safe and efficient operation of signalized intersections in the presence of automated vehicles (AVs).

Assessment of the Applicability of Bus Rapid Transit on Conventional Highways—Case Study Feasibility Analyses Along the Lincoln Boulevard Corridor

Skabardonis, Alex
Miller, Mark A.
Li, Irene Yue
Cervero, Robert
Murakami, Jin
Zou, Zhijun
Richman, Neal
Wong, Norman
2009

This report presents the results of a performance assessment of the applicability of bus rapid transit on conventional highways in the setting of a site-specific case study along the Lincoln Boulevard corrider in Santa Monica, California. When bus rapid transit systems are implemented on conventional highways, especially on arterials, there are numerous bus priority treatments that can be applied and each has associated with it issues that need to be investigated. In this study, we are investigating concurrent flow curb bus lanes based on the removal of peak period parking along the...

Freeway Performance Measurement System (PeMS) Version 4

Varaiya, Pravin
2004

PeMS 4 is the latest of four task orders devoted to research, development, and maintenance of the PeMS system. PeMS collects, processes, stores, and makes available online data from the six Caltrans districts (D3, 4, 7, 8, 11, 12), which include the major urban areas in California. The data are obtained from 23,237 loops, grouped into 7,359 vehicle detector stations (VDS). These loops cover 2,812 out of 30,726 miles of interstate and state highways in California. PeMS began as a research project. As the research system evolved, Caltrans determined that the information it provided was very...