Land Use and Built Environment

Multi-Lane Hybrid Traffic Flow Model: Quantifying the Impacts of Lane-Changing Maneuvers on Traffic Flow

Laval, Jorge A.
Carlos Daganzo
2004

A multi-lane traffic flow model realistically captures the disruptive effects of lane- changing vehicles by recognizing their limited ability to accelerate. While they accelerate, these vehicles create voids in the traffic stream that affect its character. Bounded acceleration explains two features of freeway traffic streams: the capacity drop of freeway bottlenecks, and the quantitative relation between the discharge rate of moving bottlenecks and bottleneck speed. The model com- bines a multilane kinematic wave module for the traffic stream, with a detailed constrained-motion model to...

Geographical Routing Using Partial Information for Wireless Ad Hoc Networks

Jain, Rahul
Puri, Anuj
Raja Sengupta
2001

In this paper, we present an algorithm for routing in wireless ad hoc networks using information about geographical location of the nodes. We assume each node knows its geographical position and the position of the node to which it wants to send a packet. Initially, the nodes only know their neighbors but over time they discover other nodes in the network. The routing table at a node S is a list ((pi, Si)) where pi is a geographical position and Si is a neighbor of node 5’. When node S receives a packet for a node D at position pos(D), it finds the pi in its routing table which is closest...

An Architecture for UAV Team Control

Rathinam, Sivakumar
Zennaro, Marco
Mak, Tony
Raja Sengupta
2004

Recent years has seen a widespread interest in the use of Unmanned aircraft vehicles for military applications. These UAV's can be used in many applications such as surveillance, information gathering, suppression of enemy defenses, air to air combat, mapping buildings and facilities etc. In this paper, we present an architecture with the necessary algorithms that we have implemented to control a team of UAVs to search for targets such as SAMs, ground troops, artillery, tanks etc in a given region.

A Multi-channel VANET Providing Concurrent Safety and Commercial Services

Mak, Tony K.
Laberteaux, Kenneth P.
Raja Sengupta
2005

One of the key goals of a vehicular ad-hoc network (VANET) is providing sufficient quality of service (QoS) for real-time safety applications while concurrently supporting commercial services. This paper proposes a multi-channel wireless communication architecture and protocol for the scenario where commercial services are provided by roadside infrastructure. This solution extends the IEEE 802.11 wireless LAN protocol to schedule periodic safety messages in a "safety channel". It explicitly supports concurrent non-time-critical communications in separate, non-safety "service channels"....

Vision-Based Following of Structures Using an Unmanned Aerial Vehicle (UAV)

Rathinam, Sivakumar
Kim, ZuWhan
Raja Sengupta
2006

Inspecting and monitoring oil-gas pipelines, roads, bridges, canals are very important in ensuring the reliability and life expectancy of these civil systems. An autonomous Unmanned Aerial Vehicle (UAV) can decrease the operational costs, expedite the monitoring process and be used in situations where a manned inspection is not possible. This paper addresses the problem of monitoring these systems using an autonomous UAV based on visual feedback. A single structure detection algorithm that can identify and localize various structures including highways, roads, and canals is presented in...

The software architecture of the Berkeley UAV Platform

Tisdale, John
Ryan, Allison
Zennaro, Marco
Xiao, Xiao
Caveney, Derek
Rathinam, Siva
Hedrick, J. Karl
Raja Sengupta
2006

This paper details the software architecture of the Berkeley unmanned aerial vehicle (UAV) platform. Developed over the course of three years, this platform has successfully demonstrated autonomous vision-based navigation and obstacle avoidance. A software architecture has been developed to allow for collaborative control concepts to be examined. This modular architecture has been shown to be effective for use in allowing a team of UAVs to collaboratively perform a set of missions. The performance of the architecture was demonstrated using 3 UAVs to perform autonomous collaborative...

Vision-Based Monitoring of Locally Linear Structures Using an Unmanned Aerial Vehicle1

Rathinam, Sivakumar
Kim, Zu Whan
Raja Sengupta
2008

Inspecting and monitoring oil-gas pipelines, roads, rivers, and canals are very important in ensuring the reliability and life expectancy of these civil systems. An autonomous unmanned aerial vehicle (UAV) can decrease the operational costs, expedite the monitoring process, and be used in situations where a manned inspection is not possible. This paper addresses the problem of monitoring these systems using an autonomous UAV based on visual feedback. A single structure detection algorithm that can identify and localize various structures including highways, roads, and canals is presented...

Safetrip-21: Connected Traveler

Raja Sengupta
Misener, Jim
Ahern, Katherine
Chan, Ching-Yao
Gupta, Somak Datta
Jariyasunant, Jerry
Li, Jing-Quan
Long, Christopher
Mai, Eric
Manasseh, Christian
Nowakowski, Christopher
O’Connell, Jessica
Rezai, Shahram
Steelhorst, Michael
Zhang, Liping
Zhang, Wei-Bin
Zhou, Kun
Zhou, Xeusong
2010

The US DOT RITA Volpe Center entered into a cooperative agreement with the California Department of Transportation (Caltrans) to establish the inaugural SafeTrip 21 field test site in the San Francisco Bay area [named Connected Traveler]. Specifically, the site encompasses I-880 from Oakland to San Jose on the east bay and from San Jose to just south of the San Francisco International Airport, along U.S. 101 and California State Route (SR) 82. The site includes the SR-84 Dumbarton Bridge toll crossing, which links I-880 and U.S. 101. Caltrans's partners include the Metropolitan...

A Casual Analysis of FlexPass: Incentives for Reducing Parking Demand

Tang, Dounan
Lin, Ziheng
Raja Sengupta
2016

A parking incentive program named FlexPass have been conducted in University of California, Berkley. The causal structure underlying employee parking behavior is examined in this study by a randomized controlled trial, where participants receiving treatment were offered incentives for parking less and taking other modes. This field experiment lasted for three months and recruited 392 staff and faculty members. Practicable problems encountered during the study were non-random differential dropout after the group assignment and non-ignorable missing data. Missing data were measured by follow...

Freeway Expansion and Land Development: An Empirical Analysis of Transportation Corridors

Mark Hansen
Gillen, David
Puvathingal, Mohnish
2001

Road transport infrastructure can, together with other factors, influence location choices and decisions involving residential, commercial, and industrial development. The network of roads and highways provides a means for access for workers and materials as well as a way for distributing products and services. Greater access lowers the costs of transportation and therefore increases the supply of many resources, including land, labor, and materials. An investment in highway infrastructure can have a variety of land use impacts, depending upon which of the above factors have been affected...