Nikiforos Stamatiadis - Academia.edu (original) (raw)

Papers by Nikiforos Stamatiadis

Transportation research procedia, 2022

The COVID-19 pandemic has significantly influenced people’s lifestyles including their travel cho... more The COVID-19 pandemic has significantly influenced people’s lifestyles including their travel choices. The pandemic resulted in placing restrictions in travelling throughout Italy due to the obligatory need for social distancing and changes in public transport services. City residents changed their mobility patterns and started using their private vehicles more often instead of public transport, while choosing to walk or cycle for short distance trips. Governments and local authorities encouraged citizens to use sustainable travel modes, particularly walking, during the pandemic period. However, the high number of infections and deaths, especially in Italy, has strongly influenced the propensity of walking due to the emotional aspects of travelling. This paper presents a statistical analysis based on data gathered through a questionnaire in urban areas of Sicily focusing on travel by walking for either leisure or work. The evaluation of negative emotions that people who habitually walk for short distances in the study areas is the main focus of the present work.The data indicated a variation between three emotions: anxiety, stress, and fear. These emotions had a potential to influence people’s daily life and, as a result, their travel habits.

Transportation research circular, Jul 1, 2004

Euclid Avenue is a minor urban arterial and is considered the north boundary of the University of... more Euclid Avenue is a minor urban arterial and is considered the north boundary of the University of Kentucky campus. Euclid Avenue serves as a connector between the University of Kentucky and several residential areas to the east and south. The project involved resurfacing and restripping of an existing four-lane road into a three-lane roadway with bike lanes over a distance of approximately 0.80 mi. The route serves local traffic and regional commuters, it has a mixed land use of retail and housing, it carries a significant traffic volume (20,000 average daily traffic), it carries significant pedestrian and bicycle volumes, and it is used as the connector between the university and residential areas to the south. The purpose of this project was improvement of mobility needs of the area due to congestion at some intersections along the corridor. Efforts to improve mobility and safety of pedestrians were also incorporated later as a result of public involvement. Context-sensitive design (CSD) issues included the following: a public involvement meeting; the use of simulation techniques to evaluate alternative designs; use of bike lanes along the entire corridor; and use of a single corridor for all modes of transportation.

Transportation Research Board 89th Annual MeetingTransportation Research Board, 2010

In recent years, Context Sensitive Solutions (CSS) has been promoted by both the American Associa... more In recent years, Context Sensitive Solutions (CSS) has been promoted by both the American Association of State Highway and Transportation Officials (AASHTO) and Federal Highway Administration (FHWA) as a best practice for project development. CSS provides a systematic and comprehensive approach to project development from inception and planning through operations and maintenance. The ability to categorize and measure the benefits of CSS projects is vital to the long-term success of this approach. The objective of this project is to develop a guide for transportation officials and professionals that identifies a comprehensive set of CSS performance measures and quantifies the resulting benefits through all phases of project development. A fundamental aspect of this research effort is the identification of CSS action principles and their potential benefits. A matrix that correlates benefits to specific CSS principles was generated to allow for the development of appropriate metric indicators for each benefit. Guidelines for benefit analysis have been developed to provide transportation agencies with a set of recommended practices for assessing benefits. The guidelines emphasize the fact that CSS is a principle-driven, benefit-justified effort that can enhance an agency?s goals and interaction with stakeholders and the public. The need exists to analyze and measure the benefits of CSS and its impact on projects (e.g. cost and delay) in order to demonstrate a best use of agency resources. This need has been addressed with a guide that provides transportation agencies with a recommended method and appropriate tools.

The contents of this report reflects the views of the authors, who are responsible for the facts ... more The contents of this report reflects the views of the authors, who are responsible for the facts and accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the University of Kentucky, the Kentucky Transportation Cabinet, or the Federal Highway Administration. This report does not constitute a standard, specification, or regulation.

Transportation research procedia, 2023

Transportation Center is committed to a policy of providing equal opportunities for al persons in... more Transportation Center is committed to a policy of providing equal opportunities for al persons in recruitment, appointment, promotion, payment, training, and other employment and education practices without regard for economic, or social status and will not discriminate on the basis of race, color, ethnic origin, national origin, creed, religion, political belief, sex, sexual orientation, marital status or age.

and thanks to the members of the Study Advisory Committee for sharing their expertise and valuabl... more and thanks to the members of the Study Advisory Committee for sharing their expertise and valuable advice with us during the course of the study. We would also like to thank the employees of the Division of Transportation Planning, including Mr. Allen Rucker and Mr. Dan Inabnitt, for generously supplying the research team with valuable and necessary data. We would especially like to thank Mr. Rob Bostrom, Chairman of the Study Advisory Committee, for his numerous hours of consultation and advice, and for reviewing and editing this report.

Journal of the Transportation Research Forum, 2001

Increased traffic congestion on urban highways has prompted the need to examine and implement inn... more Increased traffic congestion on urban highways has prompted the need to examine and implement innovative ways to accommodate the traffic. Potential alternatives include the use of unusual left turn treatments, prohibition of left turns at intersections, and rerouting of left turns at a U-turn point past the intersection. This study examined the implementation of median U-turns along an urban principal arterial in Kentucky. Traffic simulation was utilized to evaluate different alternatives including signal optimization, addition of through traffic lanes, and the implementation of median U-turns in 2 stages. Study results show that median U-turn strategies proved to be a more effective tool for traffic management along this arterial than simply adding a lane in each direction. The median U-turns showed significant improvements in all operating measures of the road and average delay was the measure that improved most at all intersections.

DOAJ (DOAJ: Directory of Open Access Journals), Sep 1, 2021

Annals of Epidemiology, Dec 1, 2022

Transportation research procedia, 2020

Older drivers present a unique challenge to transportation system throughout the world. A need fo... more Older drivers present a unique challenge to transportation system throughout the world. A need for balancing mobility needs and safety issues for elderly drivers has been well documented. Past research has shown that older drivers are more involved in left turn crashes and crashes involving complex maneuvers, in comparison to other driver age groups. Recent integration of mobile technology solutions and increased familiarity of older driver population with technology, especially in younger cohorts, presents a unique opportunity to develop potential solutions. The objective of this research is to identify automated route finding that may be used by older drivers to identify "safest" routes through increased risk assessment and guidance on route choice, time of travel and required maneuvers at intersections, to reduce the overall crash representation of this driver population. This research is based on specific case study and it used the ArcGIS Network Analyst extension to develop a scoring for routes and optimize them based on minimizing exposure to turns while balancing route length. The results showed that it is feasible to identify safer routing choices for older drivers. These "safe" routes are also significantly differentiated from routes optimized by travel time alone. Moreover, safe routing may be quantified easily from readily available information sources, such as by limiting or eliminating the need to make a left turn.

Transportation Quarterly, 2001

The balancing of mobility and community desires is a delicate aspect of highway design. The notio... more The balancing of mobility and community desires is a delicate aspect of highway design. The notion of context sensitive design has emerged as a philosophy that has the potential to balance these often conflicting goals. The increased awareness of context sensitive design among the highway design community prompted the Federal Highway Administration (FHWA) and the American Association of State Highway and Transportation Officials to sponsor a scanning tour in Europe to gain insight on their approach for their practices. In the European countries that were visited, the general philosophy for highway design and project development is to create a transportation program and system that enhances community values and integrates roadways into communities and the environment. This philosophy permeates their project development process, safety improvements, roadway design concepts, geometric design guidelines, and public involvement and environmental commitments. This is the essence of the recent push to promote the context sensitive design approach in the U.S. and a shift toward this philosophy is supported by FHWA and many state departments of transportation.

Transportation Research Record, Jul 30, 2022

In the United States, highway functional classification has played a central role in planning and... more In the United States, highway functional classification has played a central role in planning and designing roadway projects. Classifications have served as a surrogate for design inputs (e.g., design speed). However, functional classification lacks the resolution needed to develop context-sensitive designs and prioritizes motor vehicles over other modes of transportation. NCHRP Report 855 introduced an expanded context classification system that supports more integrative and context-adapted roadway designs. This system was subsequently adopted in the 7th Edition of the Policy of Geometric Design for Highways and Streets ( Green Book). Transitioning from functional classification to context classification as the primary basis of design entails a major shift in design practices. Context sets expectations for each setting and informs the entire project development process—from visioning to design and implementation. Based on a review of context classification systems adopted by state departments of transportation (DOTs), this paper updates the Green Book’s context classifications and introduces the concept of Transportation Expectations, which are fundamental concepts that define how users expect to move in each context. A case study focused on Lexington, Kentucky, U.S., explores these concepts and discusses how they facilitate multimodal roadway designs—the focal point of the upcoming Green Book 8th Edition.

WIT Transactions on the Built Environment, Aug 15, 2008

The behavior of older drivers has been receiving increasing attention over the last few years in ... more The behavior of older drivers has been receiving increasing attention over the last few years in the safety community. Large numbers of over 65 year-olds continue to drive into their old age mainly because of the advances in medicine and a longer active working life. This paper aims to examine the potential driver behavior differences between two samples of older drivers from two countries (Italy and USA) with very different driving habits, driving regulations and road infrastructure conditions. In particular, we examined four maneuvers (merging from a ramp, changing lanes, turning left and night driving) for which interviewees were asked to describe how they would react. The data gathered were analyzed using multidimensional techniques that enabled to identify groups having homogeneous behavior in each sample. The findings indicate that drivers of the same age exhibit different driving habits and in different driving environments react differently and are thus confronted with different situations in terms of safety. This demonstrates that, generally speaking, the older drivers in US and Italy are similar but they have a different perspective of risk that varies depending on several factors including medical conditions, driving habits, driving conditions.

Transportation Research Record, 1989

Advances in intelligent systems and computing, Dec 12, 2018

EasyChair preprints are intended for rapid dissemination of research results and are integrated w... more EasyChair preprints are intended for rapid dissemination of research results and are integrated with the rest of EasyChair.