Travel Behavior

Rail Transit Ridership Changes and COVID-19: Lessons from Station-Area Characteristics

Li, M
Rodriguez, DA
Pike, S
McNally, M
2024

The COVID-19 pandemic has had a significant impact on public transit ridership in the United States, especially for rail transit. Land use, development density, and the pedestrian environment are strongly associated with station-level transit ridership. This study examines how these characteristics affect transit ridership pre- and post-COVID and how they differ across station types based on longitudinal data for 242 rail stations belonging to Bay Area Rapid Transit, San Diego Metropolitan Transit System, Sacramento Regional Transit, and LA Metro between 2019 and 2021. We found...

Decline of Rail Transit Requires New Strategies

Rodriguez, D
Pike, S
McNally, M
Li, M
2024

During the pandemic, California’s four major rail systems— Bay Area Rapid Transit (BART), San Diego Metropolitan Transit System (MTS), Sacramento Regional Transit (SacRT), and Los Angeles County Metropolitan Transportation Authority (LA Metro)—experienced an average ridership decline of 72 percent between 2019 and 2021. BART had the greatest decrease (87 percent) and MTS the lowest (47 percent). However, ridership changes varied significantly across individual stations, with stations located in the central business district or at the end of lines having the highest ridership losses. Land...

Planning and Accommodating the Micromobility Revolution and Its Impact on Public Health

Quistberg, Alex
Rodriguez, Daniel
2024

Micromobility has grown immensely over the past decade, encompassing both public shared systems and private ownership, and, as Burford et al. have found, a surge in user injuries and deaths has accompanied the growth. Micromobility refers to the use of small vehicles, such as bicycles and scooters, that are either human powered or electric. These vehicles are ideal for short trips—although electric-powered micromobility has expanded the potential distance range.

Longitudinal State Estimation For A Four-vehicle Platoon

Merz, A. W.
1995

In this report, the estimation of longitudinal states in a four-wheel platoon is derived, discussed and illustrated numerically. The general procedure in the process is the use of dynamic equations and data, for finding the estimates and root means squared errors in the estimated of the states for each vehicle. The nonlinear dynamics of the platoon are those in the computer code developed by U.C. Berkeley. Several additional parameters require numerical specification, including data and process noise levels. The control algorithm is applied to the estimates rather than to the actual states...

Augmented Speed Enforcement Project at UC Berkeley - Executive Summary

Chan, Ching-Yao
Gupta, Somak Datta
2015

In this project, a speed alert and augmented enforcement system (aSE) was developed with a combination of sensing, image processing and recognition, wireless communication. The system includes a speed camera that captures speeding vehicles, and a changeable message sign that displays speeder’s license plate number and measured speed, and a web page that allows police officers to monitor the incidence of violators traveling at excessive speeds. The aSE system was field tested for a work zone application on a rural highway. With data collected over multiple weeks, under a baseline scenario...

Analysis of Traffic Flow With Mixed Manual and Intelligent Cruise Control Vehicles: Theory and Experiments

Bose, Arnab
Ioannou, Petros
2001

During the last decade considerable research and development efforts have been devotedto automating vehicles in an effort to improve safety and efficiency of vehicular traffic.While dedicated highways with fully automated vehicles is a future objective, theintroduction of Intelligent Cruise Control (ICC) vehicles on current highways designed tooperate with manually driven vehicles is a realistic near term objective. The purpose ofthis report is to analyze the effects on traffic flow characteristics and environment whenICC vehicles with automatic vehicle following capability (in the same...

Vehicle Navigation And Route Guidance Technologies: Push And Pull Factors Assessment

Ygnace, Jean-luc
Lavallee, Paul
Al-Deek, Haitham M.
1990

This study focusses on the development of navigation and route guidance technologies with an emphasis on existing systems, industrial strategies, market approach and human factors considerations. By considering the different situations in the US, Europe, and Japan the report analyzes the conditions under which one reasonably could assume a wide spread of these technologies with social and individual benefits.

Spatial and Temporal Factors in Estimating the Potential of Ride-sharing for Demand Reduction

Tsao, H.-S. Jacob
Lin, Da-Jie
1997

This study reports on a method to accomplish sensor validation and fusion in Intelligent Transportation Systems (ITS). The method is based on probabilistic and fuzzy techniques that express a confidence in the sensor data and take into account environmental factors and the state of the system. Sensor data fusion uses the confidence assigned to each sensor reading and integrates them into one reading. Noise and failure are filtered from the data and lead to a safety improvement in ITS.

Bicycle Detection and Operational Concept at Signalized Intersections Phase 2

Shladover, Steven E.
Kim, ZuWhan
Cao, Meng
Sharafsaleh, Ashkan
Li, Irene
Johnston, Scott
1997

This study reports on a method to accomplish sensor validation and fusion in Intelligent Transportation Systems (ITS). The method is based on probabilistic and fuzzy techniques that express a confidence in the sensor data and take into account environmental factors and the state of the system. Sensor data fusion uses the confidence assigned to each sensor reading and integrates them into one reading. Noise and failure are filtered from the data and lead to a safety improvement in ITS.

Evaluation of ITS Technology for Bus Transit Systems

Hall, Randolph
Dessouky, Maged
Zhang, Lei
Singh, Ajay
Patel, Vishal
1999

Recently, bus transit service providers have begun to adopt Intelligent Transportation Systems (ITS) technologies such as Global Positioning Systems (GPS) and Mobile Data Terminals. These systems taken together have the potential to reduce the cost of providing transportation services through the execution of real-time control strategies, performance monitoring systems and data collection to support service realignment. We evaluate bus control strategies using ITS against those without ITS. Two levels of ITS are considered: (1) system with centralized tracking and (2) system with...