1. |
- Ahlström, Christer, et al.
(författare)
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Effects of visual, cognitive and haptic tasks on driving performance indicators
- 2012
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Ingår i: Advances in Human Aspects of Road and Rail Transportation. - San Francisco, USA : CRC Press. - 9781439871232 ; , s. 673-682
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Konferensbidrag (refereegranskat)abstract
- A driving simulator study was conducted by using the same setup in two driving simulators, one with a moving base and one with a fixed base. The aim of the study was to investigate a selection of commonly used performance indicators (PIs) for their sensitivity to secondary tasks loading on different modalities and levels of difficulty, and to evaluate their robustness across simulator platforms. The results showed that, across platforms, the longitudinal PIs behaved similarly whereas the lateral control and eye movement based performance indicators differed. For modality, there were considerable effects on lateral, longitudinal as well as eye movement PIs. However, there were only limited differences between the baseline and the cognitive and haptic tasks. For difficulty, clear effects on PIs related to lateral control and eye movements were shown. Additionally, it should be noted that there were large individual differences for several of the PIs. In conclusion, many of the most commonly used PIs are susceptible to individual differences, and, especially the PIs for lateral control, to the platform and environment where they are acquired, which is why generalizations should be made with caution.
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2. |
- Aramrattana, Maytheewat, 1988-, et al.
(författare)
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A Novel Risk Indicator for Cut-In Situations
- 2020
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Ingår i: 2020 IEEE 23rd International Conference on Intelligent Transportation Systems, ITSC 2020. - Piscataway, NJ : Institute of Electrical and Electronics Engineers Inc.. - 9781728141497 - 9781728141503
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Konferensbidrag (refereegranskat)abstract
- Cut-in situations occurs when a vehicle intentionally changes lane and ends up in front of another vehicle or in-between two vehicles. In such situations, having a method to indicate the collision risk prior to making the cut-in maneuver could potentially reduce the number of sideswipe and rear end collisions caused by the cut-in maneuvers. This paper propose a new risk indicator, namely cut-in risk indicator (CRI), as a way to indicate and potentially foresee collision risks in cut-in situations. As an example use case, we applied CRI on data from a driving simulation experiment involving a manually driven vehicle and an automated platoon in a highway merging situation. We then compared the results with time-to-collision (TTC), and suggest that CRI could correctly indicate collision risks in a more effective way. CRI can be computed on all vehicles involved in the cut-in situations, not only for the vehicle that is cutting in. Making it possible for other vehicles to estimate the collision risk, for example if a cut-in from another vehicle occurs, the surrounding vehicles could be warned and have the possibility to react in order to potentially avoid or mitigate accidents.
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3. |
- Aramrattana, Maytheewat, et al.
(författare)
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A simulation framework for cooperative intelligent transport systems testing and evaluation
- 2019
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Ingår i: Transportation Research Part F. - Kidlington : Elsevier. - 1369-8478 .- 1873-5517. ; 61:February, s. 268-280
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Tidskriftsartikel (refereegranskat)abstract
- Connected and automated driving in the context of cooperative intelligent transport systems (C-ITS) is an emerging area in transport systems research. Interaction and cooperation between actors in transport systems are now enabled by the connectivity by means of vehicle-to-vehicle and vehicle-to-infrastructure (V2X) communication. To ensure the goals of C-ITS, which are safer and more efficient transport systems, testing and evaluation are required before deployment of C-ITS applications. Therefore, this paper presents a simulation framework-consisting of driving-, traffic-, and network-simulators-for testing and evaluation of C-ITS applications. Examples of cooperative adaptive cruise control (CACC) applications are presented, and are used as test cases for the simulation framework as well as to elaborate on potential use cases of it. Challenges from combining the simulators into one framework, and limitations are reported and discussed. Finally, the paper concludes with future development directions, and applications of the simulation framework in testing and evaluation of C-ITS.
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4. |
- Aramrattana, Maytheewat, et al.
(författare)
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A Simulation Study on Effects of Platooning Gaps on Drivers of Conventional Vehicles in Highway Merging Situations
- 2021
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Ingår i: IEEE transactions on intelligent transportation systems (Print). - Piscataway, NJ : Institute of Electrical and Electronics Engineers Inc.. - 1524-9050 .- 1558-0016.
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Tidskriftsartikel (refereegranskat)abstract
- Platooning refers to a group of vehicles that--enabled by wireless vehicle-to-vehicle (V2V) communication and vehicle automation--drives with short inter-vehicular distances. Before its deployment on public roads, several challenging traffic situations need to be handled. Among the challenges are cut-in situations, where a conventional vehicle--a vehicle that has no automation or V2V communication--changes lane and ends up between vehicles in a platoon. This paper presents results from a simulation study of a scenario, where a conventional vehicle, approaching from an on-ramp, merges into a platoon of five cars on a highway. We created the scenario with four platooning gaps: 15, 22.5, 30, and 42.5 meters. During the study, the conventional vehicle was driven by 37 test persons, who experienced all the platooning gaps using a driving simulator. The participants' opinions towards safety, comfort, and ease of driving between the platoon in each gap setting were also collected through a questionnaire. The results suggest that a 15-meter gap prevents most participants from cutting in, while causing potentially dangerous maneuvers and collisions when cut-in occurs. A platooning gap of at least 30 meters yield positive opinions from the participants, and facilitating more smooth cut-in maneuvers while less collisions were observed.
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5. |
- Aramrattana, Maytheewat, et al.
(författare)
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Cooperative Driving Simulation
- 2016
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Ingår i: Proceedings of the Driving Simulation Conference 2016. ; , s. 123-132
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Konferensbidrag (refereegranskat)abstract
- For a few decades, driving simulators have been supporting research and development of advanced driver assistance systems (ADAS). In the near future, connected vehicles are expected to be deployed. Driving simulators will need to support evaluation of cooperative driving applications within cooperative intelligent transportation systems (C-ITS) scenarios. C-ITS utilize vehicle-to-vehicle and vehicle-to-infrastructure (V2X) communication. Simulation of the inter vehicle communication is often not supported in driving simulators. On the other hand, previous efforts have been made to connect network simulators and traffic simulators, to perform C-ITS simulations. Nevertheless, interactions between actors in the system is an essential aspect of C-ITS. Driving simulators can provide the opportunity to study interactions and reactions of human drivers to the system. This paper present simulation of a C-ITS scenario using a combination of driving, network, and traffic simulators. The architecture of the solution and important challenges of the integration are presented. A scenario from Grand Cooperative Driving Challenge (GCDC) 2016 is implemented in the simulator as an example use case. Lastly, potential usages and future developments are discussed.
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6. |
- Aramrattana, Maytheewat, et al.
(författare)
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Safety Analysis of Cooperative Adaptive Cruise Control in Vehicle Cut-in Situations
- 2017
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Ingår i: Proceedings of 2017 4th International Symposium on Future Active Safety Technology towards Zero-Traffic-Accidents (FAST-zero). - : Society of Automotive Engineers of Japan.
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Konferensbidrag (refereegranskat)abstract
- Cooperative adaptive cruise control (CACC) is a cooperative intelligent transport systems (C-ITS) function, which especially when used in platooning applications, possess many expected benefits including efficient road space utilization and reduced fuel consumption. Cut-in manoeuvres in platoons can potentially reduce those benefits, and are not desired from a safety point of view. Unfortunately, in realistic traffic scenarios, cut-in manoeuvres can be expected, especially from non-connected vehicles. In this paper two different controllers for platooning are explored, aiming at maintaining the safety of the platoon while a vehicle is cutting in from the adjacent lane. A realistic scenario, where a human driver performs the cut-in manoeuvre is used to demonstrate the effectiveness of the controllers. Safety analysis of CACC controllers using time to collision (TTC) under such situation is presented. The analysis using TTC indicate that, although potential risks are always high in CACC applications such as platooning due to the small inter-vehicular distances, dangerous TTC (TTC < 6 seconds) is not frequent. Future research directions are also discussed along with the results.
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7. |
- Aramrattana, Maytheewat, 1988-, et al.
(författare)
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Simulation of cut-in by manually driven vehicles in platooning scenarios
- 2017
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Ingår i: IEEE Conference on Intelligent Transportation Systems, Proceedings, ITSC. - Piscataway, NJ : IEEE. - 9781538615256 - 9781538615263 - 9781538615270
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Konferensbidrag (refereegranskat)abstract
- In the near future, Cooperative Intelligent Transport System (C-ITS) applications are expected to be deployed. To support this, simulation is often used to design and evaluate the applications during the early development phases. Simulations of C-ITS scenarios often assume a fleet of homogeneous vehicles within the transportation system. In contrast, once C-ITS is deployed, the traffic scenarios will consist of a mixture of connected and non-connected vehicles, which, in addition, can be driven manually or automatically. Such mixed cases are rarely analysed, especially those where manually driven vehicles are involved. Therefore, this paper presents a C-ITS simulation framework, which incorporates a manually driven car through a driving simulator interacting with a traffic simulator, and a communication simulator, which together enable modelling and analysis of C-ITS applications and scenarios. Furthermore, example usages in the scenarios, where a manually driven vehicle cut-in to a platoon of Cooperative Adaptive Cruise Control (CACC) equipped vehicles are presented.
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8. |
- Bhatti, Harrison John, 1979-, et al.
(författare)
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A Multidimensional Readiness Index for the Electrification of the Transportation System in China, Norway, and Sweden
- 2023
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Ingår i: Future Transportation. - Basel : MDPI. - 2673-7590. ; 3:4, s. 1360-1384
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Tidskriftsartikel (refereegranskat)abstract
- The main objective of this paper is to develop a readiness index model that can serve as an analytical tool for exploring the achievements of the electrification of transportation systems. We have applied this readiness index model to evaluate the readiness positioning of China, Norway, and Sweden towards transportation electrification. We have chosen these three countries as they represent diversity among countries adopting electric transportation system solutions. Our developed readiness index model has four key dimensions: technological readiness, political readiness, societal readiness, and economic readiness. The embeddedness of all four dimensions in one model provides a multi-perspective way of analyzing and evaluating the readiness levels of countries moving towards transforming their transportation system. Therefore, we named the model a “multidimensional readiness index”. Our main conclusions are that political processes and decisiveness are the most important factors, followed by societal needs and economic ability, with the current technology as the fourth. Without the participation of dedicated and determined political decision makers, the other three factors are challenging to obtain. Political decision makers need to facilitate economic means to support the transformation in society and affected industries to balance the economic disadvantages of the electrically powered vehicle systems until they pass the cost disadvantage turning point. The development of relevant technology is no longer the significant barrier it was at the beginning of this transformation about 20 years ago. The technology for electrically powered transportation systems and devices is widely available now, although it is continuously evolving and being improved. Associated industries cannot be expected to initiate, finance, take risks, and take the lead in this global societal transformation without clear and strong political support.
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9. |
- Bhatti, Harrison John, 1979-, et al.
(författare)
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A System Approach to Electrification of Transportation – An International Comparison
- 2022
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Globally, the transportation system is transforming from a fossil-based to an electrification system. Some countries are leading in the transformation process. Some countries are rapidly catching up to become market leaders in developing and introducing new techniques and equipment that support the transformation process in their countries. In contrast, others are still relying on their old fossil-based system or could not have enough understanding of how to deal with this complex transformation of the transportation system.The electrification of the transportation system is not an isolated system that can be handled as a single technological element. It is a group of multiple technologies, political, societal, and economic sub-systems each of these sub-systems is embedded in each other, forming the whole system. Therefore, it is important to see and manage the system from a holistic perspective to transform the transportation electrification system efficiently. We have selected eight countries from three different continents – Asia (China, India), Australia, which is a country and continent, and Europe (Germany, Norway, Slovenia, Sweden, and the UK) to explore the transformational process of transportation electrification based on each countries’ conditions. We have chosen these continents as they are diversified in adopting transportation electrification system solutions.Our main conclusions are that the political processes and political decisiveness are the most important, followed by the societal and economic, with technology as the fourth. The other three are difficult to obtain without dedicated and determined political decision-makers. Political decision-makers need to use economic means to support the transformation in society and industry to balance the economic disadvantage of electric systems until they pass the cost disadvantage turning point. Technology is no longer a significant barrier as it was about 20 years ago. Now, technology is available, although it can be improved. The important part is to understand how to utilize the existing technology efficiently to transform the old fossil-based transportation system into new electrification of the transportation system. Without clear and strong political support, the industry cannot be expected to initiate, finance, take risks, and take the lead in this global societal transformation.Our analysis shows that China is being positioned as the leading country in the world in the electrification of the transportation system because of the strong technological advancements, control of the entire value chain, strong government decisiveness, and execution power in developing and implementing favorable electric vehicle (EV) policies, the willingness of the public sector to take the lead and citizens support to adopt clean technology. Norway has rapidly become one of the newcomers with large numbers of registered electric vehicles according to its population size within a few years, despite lacking manufacturing electric vehicles (EVs) and equipment for transportation electrification. Germany is leading in the technological sector of transportation electrification within Europe with its prestigious top-selling electric vehicle brands in Germany, such as Volkswagen, Mercedes Benz, BMW, Smart, and Audi, and establishing a battery Gigafactory with an annual potential production capacity of 60 GWh. However, Germany is still lagging behind from the societal perspective of not having enough sales of electric vehicles compared to gasoline-based vehicles. Sweden is a rapidly growing country in the electrification of transport, with three vehicle manufacturers introducing EVs in 2021 and developing electric roads system for more than ten years. Sweden is also working on establishing a new 50 GWh battery manufacturing plant in Gothenburg, Sweden. The UK is also catching up with its other European countries in transforming the transportation system with its strong government support. The British government has kept transportation electrification on its national agenda and considering building a Gigafactory to obtain a position as a future battery leader. However, the UK's adoption rate of electric vehicles is still slow compared to fossil-based vehicles. India, Australia, and Slovenia are far behind in the process of transportation transformation than China, Norway, Germany, Sweden, and the UK. One of the common reasons in all these countries is their governments' baby steps even though they have high ambitions. Their governments require a revolutionized and systems approach to enable remarkable change in the transformation process.
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10. |
- Bhatti, Harrison John, 1979-, et al.
(författare)
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Electric Roads : Energy Supplied by Local Renewable Energy Sources and Microgrid Distribution System
- 2019
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The electric road system is an emerging concept in this modern era. The advancement of technology has made it possible to give this concept a real shape (electric road system). However, the energy provided to the electric roads is still produced by non-renewable energy sources, which are completely unhealthy and harmful for society. Furthermore, the traditional grid is not suited to integrate with decentralized/localized energy generation and distribution systems. It is an ineffectual and environmentally extravagant system. Therefore, the preliminary contribution of this research is to introduce a decentralized/localized energy generation system based on renewable energy sources and energy distribution to electric roads through the emerging technology of microgrid and smart grid systems, which have the capability to integrate with renewable energy sources easily. Thus, producing electricity with renewable energy sources is environmentally friendly, less expensive, and available without charges. However, each source of energy has some environmental impacts and cost differences. A brief description of the environmental and cost impact of renewable energy sources (wind, solar) is also presented.
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