我国车辆超载现状分析及对策研究

近年来,我国交通运输中超载问题日益严重,已成为危及人民群众生命和国家财产安全的一个突出性社会问题。本文就国内车辆超载的原因、及其造成的危害、治理的对策和建议等四个方面进行了论述。     

Combining stated and revealed choice research to simulate the neighbor effect: The case of hybrid-electric vehicles

According to intuition and theories of diffusion, consumer preferences develop along with technological change. However, most economic models designed for policy simulation unrealistically assume static preferences. To improve the behavioral realism of an energy–economy policy model, this study investigates the “neighbor effect,” where a new technology becomes more desirable as its adoption becomes more widespread in the market. We measure this effect as a change in aggregated willingness to pay under different levels of technology penetration. Focusing on hybrid-electric vehicles (HEVs), an online survey experiment collected stated preference (SP) data from 535 Canadian and 408 Californian vehicle owners under different hypothetical market conditions.Revealed preference (RP) data was collected from the same respondents by eliciting the year, make and model of recent vehicle purchases from regions with different degrees of HEV popularity: Canada with 0.17% new market share, and California with 3.0% new market share. We compare choice models estimated from RP data only with three joint SP–RP estimation techniques, each assigning a different weight to the influence of SP and RP data in coefficient estimates. Statistically, models allowing more RP influence outperform SP influenced models. However, results suggest that because the RP data in this study is afflicted by multicollinearity, techniques that allow more SP influence in the beta estimates while maintaining RP data for calibrating vehicle class constraints produce more realistic estimates of willingness to pay. Furthermore, SP influenced coefficient estimates also translate to more realistic behavioral parameters for CIMS, allowing more sensitivity to policy simulations.     

安徽省道路旅游客运车辆需求量预测分析

本文分别采用指数函数曲线预测模型、灰色简单预测模型和多元线性回归的一般模型预测安徽旅游人数,依据三种方法预测结果的加权平均数,预测了安徽道路旅游客运车辆需求量,为道路旅游客运体系的建立,能够提供科学的决策依据。     

美军有人直升机与无人机协同技术发展及启示

总结了美军有人直升机与无人机协同的相关项目的发展概况，分析了协同数据链、协同控制系统等装备的基本能力和实现方式，探讨了协同数据链、数据融合、决策辅助等关键技术的发展趋势及启示，以期为我国相关技术发展和装备研究提供一定的参考。     

Safety of motorized two-wheeler riders in the formal and informal transport sector

Abstract

Road fatalities are largely preventable problem with large socioeconomic impact. Due to the rapidly increasing population, transport systems and road infrastructure have not met the demand. The use of motorized two-wheeler vehicles has increased, as informal transport. However, evidence on their safety is scarce. The aim of this article is to examine the safety and social equity issues in MTW in the informal transport sector. Factors can be used to explain traffic collisions in MTW in the formal/informal transport sectors: design, rider behavior, road design, enforcement, and regulation of the informal transport sector. Evidence suggests that MTWs could be a common related to pedestrian fatalities. Informal transport drivers are typically poor, uneducated, young men who due to lack of other employment options move into the informal sector. Their vehicles are old, unmaintained and have a lack of protective equipment for themselves and their passengers. Young, male drivers speed, take risks and not use protective equipment. Users of informal transport live in the poorer peripheries of cities, which, have limited, inefficient or unaffordable public transport. The provision of transport has therefore become an often unrecognized, important social equity issue and studies are urgently needed on MTW in the informal transport sector.     

An examination of the effects of ride-hailing services on airport parking demand

The emergence of ride-hailing services offered by the Transportation Network Companies (TNCs) globally are substantially affecting how we travel by car, and as such, use parking facilities. Airport parking, which is a substantial source of revenue for the airports, is no different and anecdotal evidence suggest a reduction in parking revenue in airports in recent years as a result of the popularity of ride-hailing services. This research investigates the effects of the entry of ride-hailing services on airport parking patronage using three large airports (John F Kennedy International, Newark Liberty International and LaGuardia) in the US as a case study. Intervention analysis technique was used on time-series monthly parking data at these airports, controlling for passenger numbers. Results indicate there was a statistically significant reduction in the numbers of cars parked at all three airports since the introduction of ride-hailing services, confirming the anecdotal evidence. Findings have implications not only for airport business and revenue models, but also for wider effects of ride-hailing and automation.     

Potential for electric vehicle adoption in Australia

Data from the New South Wales (NSW) Household Travel Survey (2014/15 NSW, T. f. (2014/15, 9/15/2016). SA3 Household Travel Survey (HTS). Retrieved from https://drive.google.com/open?id=0B12S3-OIR0hOT3oyYzJnMVp1UWs [Google Scholar]) was analyzed to determine the trip-by-trip range of automobile travel in NSW. The results show that 88% of trips were less than 30?km, which could readily be provided by electric vehicles, consuming a total of 18?GWh in electrical energy per weekday. Even if all electric vehicles were recharged from non-renewable coal-fired power plants, the greater efficiency of electric vehicles would result in a reduction of greenhouse gas emissions across NSW by 18% carbon dioxide equivalent (CO_2(eq))_. Additionally, we mapped the average state of charge distribution of the electric vehicles at key times during the day, indicating the maximum net load (for recharging) and/or available energy (for vehicle-to-grid services) across NSW. The results are consistent with other international studies and demonstrate the potential for wide scale electric vehicles adoption in Australia.     

Evidence of a homeowner-renter gap for electric vehicles

This paper provides the first empirical analysis of the homeowner-renter gap for electric vehicles. Using newly-available U.S. nationally representative data, the analysis shows that homeowners are three times more likely than renters to own an electric vehicle. The gap is highly statistically significant, and remains even after controlling for income. For example, among households with annual income between $75,000 and $100,000, 1 in 130 homeowners owns an electric vehicle, compared to 1 in 370 renters. Additional controls do little to narrow the gap. The paper argues that this is a version of what economists have called the “landlord-tenant’’ problem, and briefly discusses potential policy implications.     

The impact of motivation,intention, and contextual factors on green purchasing behavior: New energy vehicles as an example

Green purchasing behavior is of great significance to the realization of carbon reduction goals. Through in-depth interviews, this study uses new energy vehicles to explore the driving factors of green purchase. It applies grounded theory for a qualitative analysis, the results of which show that behavior motivation, behavior intentions, residential characteristics, social norms, behavior ability, and institutional and technological context are the main factors of green purchase, albeit in inconsistent ways. It is found that behavior motivation indirectly affects green purchase through behavior intention; residents' characteristics, behavioral ability, social norms, and the institutional and technological context have moderating effects on the relationship between behavior intention and green purchase, indicating the existence of an “intention–behavior” gap. The study proposes the comprehensive model of Motivation–Intention–Context–Behavior to explain the driving factors for green purchase and provides policy implications on marketing strategy to companies producing green products.     

Assessment of the road safety performance of four roundabouts in Kumasi,Ghana

Upgrade of the Ejisu-Kumasi section of the N6 saw the construction of roundabouts at selected intersections. Their use appears challenging particularly for vehicles with elevated Centre-of-Gravity. The objective of this study was to establish the relative risk of traffic accident deaths or hospitalized injuries at the roundabouts. Five-year crash data covering a 100 m stretch upstream and downstream of the roundabouts were analysed. A total of 119 crashes occurred with 18% casualty hospitalization and 12%fatalities. Compared with the Ejisu roundabout, fatal or hospitalized injuries were significantly higher at the Boadi (OR = 25.6, p = 0.0021) and Kwame Nkrumah University of Science and Technology Police Station Junctions (OR = 48.2, p < 0.001). Occupants of buses, heavy goods vehicles and riders of two wheelers were at elevated risk of deaths or serious injuries. Crash severity at the round abouts was aggravated by night-time, steep gradients and adverse cambers. It is recommended that, signalization and grade separation should be used in the current arrangement where appropriate.