R. Sivanandan

R. Sivanandan
Indian Institute of Technology Madras | IIT Madras · Department of Civil Engineering

Ph. D.

About

125
Publications
11,144
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
982
Citations

Publications

Publications (125)
Article
Full-text available
Driving behaviour in mixed traffic conditions is characterized by vehicle heterogeneity and lane-less movement. In such traffic conditions, the following response of a vehicle may be discontinuous and gets triggered when certain thresholds on relative speed and spacing with the leaders are crossed. In this context, the present study segments vehicu...
Article
With the increasing traffic congestion levels on urban arterials, an essential step to tackling this challenge is to effectively quantify it and understand how it relates to its contributing factors. Although researchers have proposed models that relate travel time with several traffic and roadway factors for quantifying congestion especially in th...
Conference Paper
Road traffic is a dynamic system with interdependence among road users, vehicles, and infrastructure. Among these, the road user characteristics are the most complex, with great implications on safety. In 2019, with over 150,000 road fatalities in India, road safety stood as one of the top priorities in the road sector. Over 80% of accidents are re...
Article
Full-text available
Road traffic is a dynamic system with interdependence among road users, vehicles, and infrastructure. Among these, the road user characteristics are the most complex, with great implications on safety. In 2019, with over 150,000 road fatalities in India, road safety stood as one of the top priorities in the road sector. Over 80% of accidents are re...
Article
Full-text available
Indian traffic can be considered as mixed and heterogeneous due to the presence of various types of vehicles that operate with weak lane discipline. Consequently, vehicles can position themselves anywhere in the traffic stream depending on availability of gaps. The choice of lateral positioning is an important component in representing and characte...
Article
Full-text available
A number of models for car following have been proposed for homogeneous traffic and some of these have been modified or adapted to represent mixed traffic conditions in India. Vehicle-following behavior under mixed traffic is both complex and challenging and cannot be adequately captured by conventional lane-based following models and their variant...
Conference Paper
Advanced Traveler Information Systems (ATIS) assists travelers in making informed travel decisions, thereby helping them to avoid delays and hazardous situations. This improves the overall traffic safety and performance of the network. Even if the information system provides accurate and reliable information, if the travellers do not perceive the s...
Chapter
Accurate prediction of pollutant concentration is very important part in any air quality management program (AQMP). The conventional time series modelling techniques like ARIMA has showing poor prediction and forecasting, as air quality is non-linear and complex phenomenon. Although neural networks have been applied for prediction of air quality da...
Article
Full-text available
Advanced Traveler Information Systems (ATIS) are extensively employed to tackle the increasing traffic congestion problems. The success of ATIS depends on their ability to influence the user responses in the desired direction. Due to the limited implementations in India and lack of systematic and rigorous studies on user response to real-time traff...
Article
Understanding congestion in space-time domain using performance measures is essential prior to suggesting improvement schemes to reduce congestion. With technological advances like Global Positioning System (GPS), many metropolitan planning organizations give more emphasis on travel time based performance measures to quantify congestion, than on tr...
Conference Paper
Full-text available
A number of models for car following have been proposed for homogeneous traffic and some of these have been modified or adapted to represent mixed traffic conditions in India. The vehicle following behavior under mixed traffic is both complex and challenging and cannot be adequately captured by conventional lane-based following models and their var...
Article
This study presents the characteristics of real world, real time, on-road vehicular exhaust emission namely, carbon monoxide (CO), nitric oxide (NO), hydrocarbons (HC), and carbon dioxide (CO2) emitted under heterogeneous traffic conditions. Field experiments were performed on major category of vehicles in developing countries, i.e. two-wheelers, a...
Article
In India, traffic on roads is mixed in nature with widely varying static and dynamic characteristics of vehicles. At intersections, vehicles do not follow ordered queue and lane discipline. Different vehicle types occupy different spaces on the road, move at different speeds, and start at different accelerations. The problem of measuring volume of...
Article
This paper presents the characterization and modeling of exhaust emissions released from the passenger cars on urban roads under heterogeneous traffic conditions. Onboard exhaust emissions measurement were made at selected corridors in a populous urban area of India. Exhaust emissions were characterized for different driving modes classified accord...
Article
To understand the congestion problem and the occurrence of bottlenecks and to formulate solutions for it, a thorough study of vehicle-to-vehicle interactions is necessary. Car-following models replicate the behavior of a driver following another vehicle. These models are widely used in the development of traffic simulation models, and in analysis o...
Article
Full-text available
Modeling traffic flow is stochastic in nature due to randomness in variables such as vehicle arrivals and speeds. Due to this and due to complex vehicular interactions and their manoeuvres, it is extremely difficult to model the traffic flow through analytical methods. To study this type of complex traffic system and vehicle interactions, simulatio...
Article
Full-text available
Mixed traffic flow with high composition of motorcycles is a common situation in many urban areas in South Asian countries like India. It consists of vehicles having diverse static and dynamic characteristics. This type of traffic is characterized by lack of queue and lane disciplines. Motorcycles, due to their smaller size, have greater freedom to...
Article
In developing countries like India, the traffic on urban roads is highly heterogeneous in nature, with vehicles of widely varying static and dynamic characteristics. This type of traffic is characterized by lack of queue and lane discipline (lane-less movement) based on availability of spaces near intersections. Moreover, at intersections, straight...
Article
Full-text available
Free-flow speed (FFS) is defined as the speed drivers choose under very low traffic flow conditions when impedance due to adjacent vehicles is negligible. Estimation of FFS is important in several applications. FFS varies extensively across various road facilities as they are influenced by driver behaviour, vehicle characteristics, road factors, la...
Conference Paper
Full-text available
The vehicle speed and lane choice data under free-flow conditions essentially capture the driver and vehicle behaviour as vehicle to vehicle interaction is absent. Past studies indicate that side friction is a defining factor of free-flow speed. However, most studies on multi-lane roads assume that the effect of side friction is uniform throughout...
Conference Paper
Full-text available
Car-following models replicate the behavior of a driver following another vehicle. These models are widely used in the development of traffic simulation models. Only fewer studies have been conducted to compare the performance of different car following models under mixed traffic conditions. The present study focuses on the evaluation of different...
Article
Mixed traffic in the cities of many developing countries is characterized by a lack of lane discipline, varying compositions of constituent vehicle types, and significant intraclass variability in static and dynamic characteristics. However, the influence of these factors on traffic flow parameters is not well understood. This study addressed the i...
Conference Paper
Time headway between vehicles is an important traffic flow characteristic affecting safety, level of service, driver behavior, and capacity of a transportation system. However, almost all the reported research on headway is focused on mixed vehicular flow without considering the difference in headway with respect to different lead and lag vehicle t...
Article
Full-text available
In developing countries such as India, the traffic on roads is highly heterogeneous in nature, with vehicles of widely varying static and dynamic characteristics. This type of traffic is characterized by lack of lane discipline and free movement over the entire width of the roadway (laneless movement) based on availability of space. In such a regim...
Article
In developing countries like India, the traffic on roads is highly heterogeneous in nature, with vehicles of widely varying static and dynamic characteristics. In this type of traffic, vehicles do not follow lane discipline and they move freely over the entire width of roadway based on availability of space. To study this type of complex traffic fl...
Article
Travel time information is a vital component of many intelligent transportation systems (ITS) applications. In recent years, the number of vehicles in India has increased tremendously, leading to severe traffic congestion and pollution in urban areas, particularly during peak periods. A desirable strategy to deal with such issues is to shift more p...
Article
Full-text available
The behaviour of traffic in the heterogeneous environment of an urban signalized intersection is complex and difficult to model. This paper presents the development of a simulation model to imitate the flow of heterogeneous traffic through a signalized intersection. It discusses the validation of the proposed model in terms of queue density and dis...
Conference Paper
Intelligent Transportation Systems (ITS) are gaining popularity in developing countries like India. Two major components of ITS are Advanced Traveler Information System (ATIS) and Advanced Public Transportation Systems (APTS). A combined application of these two components is the estimation of bus arrival times. Accurate bus arrival time informatio...
Conference Paper
Full-text available
This paper presents the findings of a study of motorized two-wheeler emissions under lane restricted and lane-less flow conditions in heterogeneous traffic. Lane restriction is defined as the movement of particular categories of vehicles on specified lanes (dedicated lanes), whereas lane-less flow movements are conditions when vehicles are free to...
Article
Roads in India carry heterogeneous traffic with wide variations in static and dynamic characteristics of vehicles. The traffic flow is also generally devoid of lane discipline, with vehicles occupying any available road space ahead. Modeling of such heterogeneous traffic is generally complex in nature and simulation has been proven to be effective...
Article
Full-text available
A major cause for air pollution in urban areas is exhaust emissions from vehicles. Vehicular emissions are mainly caused due to high volume of traffic and changes in driving speeds. Traffic management measures can reduce the vehicular emissions by smoothing traffic flow. One way to achieve a smoother flow of traffic is to synchronise the signals. I...
Article
The role of individual's attitudes and perception in travel decision making is a growing and active area of research. Various theories are propounded to correctly predict the travel behaviour. This paper aims at a discussion on attitude, perception and behaviour as used in various research outputs. It also attempts to identify major empirical and t...
Article
Typically the evaluation of transportation improvement projects necessitates the evaluation of the environmental impacts of these projects. However, the environmental evaluation is typically difficult, particularly, in the pre-implementation stage and in the presence of various types of vehicles with differing fuel consumption and emission characte...
Article
Knowledge of motorists’ origin–destination (OD) travel information is necessary for a wide range of transportation planning activities. The high cost of manpower and other expenses associated with conventional survey techniques for OD estimation have motivated the development of models that can inexpensively estimate these flows from easily availab...