Performance Evaluation of Hybrid-Drive Buses and Potential Fuel Savings in Brazilian Urban Transit

Transporting more than 55 million passengers per day, buses are the main transit mode in Brazil. Most of these vehicles use diesel oil and this situation causes dependence on oil, extensive greenhouse gas emissions and increasing air pollution in urban areas. In order to improve this situation the options for Brazilian cities include the use of alternative fuels and new propulsion technologies, such as hybrid vehicles. This article proposes a procedure for evaluating the performance of a recently developed Brazilian hybrid-drive technology. A simple procedure is presented to compare hybrid-drive buses with conventional diesel buses in urban operation focusing on fuel economy and the potential for reducing diesel oil consumption through the use of hybrid-drive buses. Field tests carried out by the authors indicate that fuel consumption improvement through the use of hybrid-drive buses would certainly exceed 20%, resulting in lower fuel costs and reduced carbon dioxide (CO₂) emissions.     

The Impact of Urban Freight Transport: A Definition of Sustainability from an Actor's Perspective

Abstract

This paper presents a definition of sustainable urban freight transport (SUFT), based on the existing theories and concepts, and develops an indicator set that describes SUFT. The definition of SUFT makes a categorisation of actions possible which enables actors to select effective strategies towards SUFT. The indicator set consists of two levels: impact indicators – which describe how the urban freight transport violates the principles of sustainability; and performance indicators – which describe different categories determining the characteristics and performance of the urban transport system. A literature study analyses the characteristics determining the performance of actors in the urban freight transport chain. Knowing the current state and improvement potential of the urban freight transport system are prerequisites for defining successful strategies and implementing effective actions.     

河池市城乡公交客运发展思路探析

文章基于广西河池市城乡公交客运发展情况,分析了发展城乡公交客运存在的问题,提出了加快城乡公交客运发展的建议,为河池市加快发展城乡公交客运提供思路。     

城市道路的工程质量管理与控制

质量管理是现代管理中的重要部分 ,管理与控制是质量管理的中心内容。本文介绍大庆市世纪大道工程在建设过程中的质量管理与控制。     

蕴川路立交设计简介

上海蕴川路立交不仅是一座快速路和主干路相交的枢纽级立交 ,同时也是国内第一座融地铁、公交、机动车、非机动车等不同出行方式汇集在立交内的公交枢纽。立交设计时应不仅关注交通功能的完善 ,同时也应体现“以人为本 ,公交优先”的设计理念。本文介绍了蕴川路立交的工程设计。     

浅析道路工程的经济效益

本文从价值观念出发 ,就道路结构、施工质量及管理、养护等方面 ,对城市道路工程的经济性进行了浅述。     

城市快速路设计中若干问题的再认识

本文就新的交通理论在环路建设中的运用情况 ,从快速路系统整体构思角度 ,对立交、出入口、交织和路网之间的关系进行了论述。文中分析了立交及出入口设计中存在的一些问题 ,并对快速路设计中值得借鉴或需深入研究的问题提出建议。     

上海市快速路系统交通衔接对策研究

本文首先对上海市快速路系统内部及其与周边关联路网之间的衔接中已有和潜在的交通拥堵问题进行分析 ,在此基础上 ,以避免在接合部周边区域形成交通拥堵、使快速路系统更好地发挥其应有的效益为目标 ,提出相应对策     

温州城市道路交通现状及对策研究

综合分析温州城市交通现状 ,并结合城市发展规划 ,提出必须采取标本兼治的办法来解决城市日益严重的交通不畅问题     

上海市杨浦区防汛决策支持系统研究

在分析杨浦区城市防汛问题的基础上 ,设计了其防汛决策支持系统 ,并开发了基于GIS的城市地面积水的动态显示系统。系统可以迅速、可靠和正确地模拟城市雨情、水情、灾情的发展过程和可能后果 ,为城市防汛决策提供多层次的信息服务和多种支持手段