| 1. |
- Ahlström, Christer, et al.
(författare)
-
Video-based observer rated sleepiness versus self-reported subjective sleepiness in real road driving
- 2015
-
Ingår i: European Transport Research Review. - : Springer Science and Business Media LLC. - 1867-0717 .- 1866-8887. ; 7:4
-
Tidskriftsartikel (refereegranskat)abstract
- Observer-rated sleepiness (ORS) based on video recordings of the driver’s face is often used when analysing naturalistic driving data. The aim of this study is to investigate if ORS ratings agree with subjective self-reported sleepiness (SRS).Forty raters assessed 54 video-clips showing drivers with varying levels of sleepiness. The video-clips were recorded during a field experiment focusing on driver sleepiness using the same cameras that are typically used in large-scale field studies. The weak results prompted a second test. Ten human factors researchers made pairwise comparisons of videos showing the same four participants in an alert versus a very sleepy condition. The task was simply to select the video-clip where the driver was sleepy.The overall average percentage of video segments where ORS and SRS matched was 41 % in Test 1. ORS 0 (alert) and ORS 2 (very sleepy) were easier to score than ORS 1 and it was slightly harder to rate night-time drives. Inter-rater agreement was low, with average Pearson’s r correlations of 0.19 and Krippendorff’s alpha of 0.15. In Test 2, the average Pearson’s r correlations was 0.35 and Krippendorff’s alpha was 0.62. The correspondence between ORS and SRS showed an agreement of 35 %.The results indicate that ORS ratings based on real road video recordings correspond poorly with SRS and have low inter-rater agreement. Further research is necessary in order to further evaluate the usefulness of ORS as a measure of sleepiness.
|
|
| 2. |
- Almlöf, Erik, 1985-, et al.
(författare)
-
Who continued travelling by public transport during COVID-19? : Socioeconomic factors explaining travel behaviour in Stockholm 2020 based on smart card data
- 2021
-
Ingår i: European Transport Research Review. - : Springer Nature. - 1867-0717 .- 1866-8887. ; 13:1
-
Forskningsöversikt (refereegranskat)abstract
- Introduction The COVID-19 pandemic has changed travel behaviour and reduced the use of public transport throughout the world, but the reduction has not been uniform. In this study we analyse the propensity to stop travelling by public transport during COVID-19 for the holders of 1.8 million smart cards in Stockholm, Sweden, for the spring and autumn of 2020. We suggest two binomial logit models for explaining the change in travel pattern, linking socioeconomic data per area and travel data with the probability to stop travelling. Modelled variables The first model investigates the impact of the socioeconomic factors: age; income; education level; gender; housing type; population density; country of origin; and employment level. The results show that decreases in public transport use are linked to all these factors. The second model groups the investigated areas into five distinct clusters based on the socioeconomic data, showing the impacts for different socioeconomic groups. During the autumn the differences between the groups diminished, and especially Cluster 1 (with the lowest education levels, lowest income and highest share of immigrants) reduced their public transport use to a similar level as the more affluent clusters. Results The results show that socioeconomic status affect the change in behaviour during the pandemic and that exposure to the virus is determined by citizens' socioeconomic class. Furthermore, the results can guide policy into tailoring public transport supply to where the need is, instead of assuming that e.g. crowding is equally distributed within the public transport system in the event of a pandemic.
|
|
| 3. |
- Alverhed, Elin, et al.
(författare)
-
Autonomous last-mile delivery robots: a literature review
- 2024
-
Ingår i: European Transport Research Review. - 1867-0717 .- 1866-8887. ; 16:1
-
Forskningsöversikt (refereegranskat)abstract
- This literature review investigates how self-driving autonomous delivery robots (ADRs) impact last-mile deliveries, add value to the logistics and transport industry, and contribute to creating competitive business models. Autonomous vehicles are still a developing technology and ADRs could possibly be one of the solutions to the last-mile problem, in particular in cities and for urban freight with an increasing number of parcels to deliver. Last-mile delivery is also changing as e-commerce and more demanding customers emerge. Such development, however, faces challenges regarding infrastructure, externalities such as CO2 emissions, and shorter delivery-time requirements. This review, focused on ADRs, reveals four major themes (operations, infrastructure, regulations, and acceptance) through which we explain the barriers and benefits of using ADRs for last-mile deliveries. The review shows that the operations of ADRs can impact last-mile deliveries by lowering costs, optimising the use of time, and reducing externalities. The review also shows that the foundation of last-mile infrastructure would have to change if ADRs are to be used to a greater extent. Regulations for ADRs are still not yet in place, which makes the market somewhat confused. The acceptance of ADRs in society is another challenge because the innovation of ADRs is still new and unfamiliar. Altogether, the use of ADRs for last-mile deliveries shows great potential, based on the promising results of the articles reviewed. However, most studies on ADRs have been theoretical in nature, such as models, which highlights the need for real-world case studies and implementations.
|
|
| 4. |
- Andersson, Henrik, et al.
(författare)
-
Benefit measures for noise abatement : calculations for road and rail traffic noise
- 2013
-
Ingår i: European Transport Research Review. - : Springer Science and Business Media LLC. - 1867-0717 .- 1866-8887. ; 5:3, s. 135-148
-
Tidskriftsartikel (refereegranskat)abstract
- PurposeThe aim of this study is to estimate monetary abatement values for road and rail traffic noise that can be used for policy purposes. However, a main objective is to critically discuss the assumptions necessary to convert the monetary values elicited in willingness to pay (WTP) studies to values than can be use for policy purposes.MethodsWe employ the hedonic regression technique on Swedish data to elicit individuals' preferences for noise abatement. Our elicited values are then converted to policy values and critically examined based on findings from a literature review.ResultsWe show that WTP for road and rail not only differs in levels but also that the relationship between the noise level and the marginal value differs between the two sources. We also show that a health cost component added to the WTP estimate, based on the assumption of uninformed property buyers, will be small but not negligible and that also modest differences in the assumption of the discount rates will have a significant effect on the estimated values.ConclusionsThe main implications from this study are: (i) WTP for road and railway noise abatement differs not only on absolute but also marginal levels, (ii) Even small differences in the chosen discount rate, which is necessary to convert WTP values from a hedonic price study to policy values, have large effects on the policy values, and (iii) We show how to add a health cost component to the WTP estimates in order for the monetary estimates to reflect the total social cost. However, we argue that the motivation for doing so is weak and that more research is needed on this issue.
|
|
| 5. |
- Antoniou, C, et al.
(författare)
-
A synthesis of emerging data collection technologies and their impact on traffic management applications
- 2011
-
Ingår i: European Transport Research Review. - : Springer Science and Business Media LLC. - 1867-0717 .- 1866-8887. ; 3:3, s. 139-148
-
Tidskriftsartikel (refereegranskat)abstract
- act Purpose: The objective of this research is to provide an overview of emerging datacollection technologies and their impact on traffic management applications. Methods: Several existing and emerging surveillance technologies are being used for traffic datacollection. Each of these technologies has different technical characteristics and operating principles, which determine the types of data collected, accuracy of the measurements, levels of maturity, feasibility and cost, and network coverage. This paper reviews the different sources of traffic surveillance data currently employed, and the types of traffic management applications they may support. Results: Automated Vehicle Identification data have several applications in traffic management and many more are certain to emerge as these data become more widely available, reliable, and accessible. Representative examples in this field are presented. Furthermore, the fusion of condition information with traffic data can result in better and more responsive dynamic trafficmanagement applications with a richer data background. Conclusions: The current state-of-the-art of traffic modeling is discussed, in the context of using emerging data sources for better planning, operations and dynamic management of road networks.
|
|
| 6. |
- Anund, Anna, et al.
(författare)
-
Is European school transport safe? : the need for a "door-to-door" perspective
- 2011
-
Ingår i: European Transport Research Review. - Berlin : Springer. - 1867-0717 .- 1866-8887. ; 3:2, s. 75-83
-
Tidskriftsartikel (refereegranskat)abstract
- Purpose To identify and establish the number and aetiology behind children being killed or injured during school transport from a door-to-door perspective by using experience from Sweden and the UK.Methods Available crash data were analysed. Results In total, 361 children in Sweden during 1994–2001, i.e. 24% of the 1,515 identified children aged 6–16 who were injured or killed were identified in 256 school transport events. The predominant reason for being killed or injured when travelling on school transportation was when children were outside the bus (74%), either when passing the bus to cross the street, running in front of the bus (21%) or behind the bus (30%). Contrary to the general belief that children older than 12 are mature enough to handle traffic, more than 50% of the fatal injuries in Sweden affected children aged 13–16. Similar results were found in the UK. The afternoon school journeys, pedestrians after alighting from the bus, and those in situations that deviated from their normal routine were found to be particularly vulnerable.Conclusions The travel chain perspective/or door to door perspective offers a promising approach for understanding school transport risks and for identifying effective countermeasures; including around bus stops and on the way to/from the bus stop. Data collection needs to be revised to reflect this approach.
|
|
| 7. |
- Anund, Anna, et al.
(författare)
-
Is European school transportation safe? : The need for a "door-to-door" perspective
- 2011
-
Ingår i: European Transport Research Review. - : Springer Science and Business Media LLC. - 1867-0717 .- 1866-8887. ; 3:2, s. 75-83
-
Tidskriftsartikel (refereegranskat)abstract
- Purpose To identify and establish the number and aetiology behind children being killed or injured during school transport from a door-to-door perspective by using experience from Sweden and the UK. Methods Available crash data were analysed. Results In total, 361 children in Sweden during 1994–2001,i.e. 24% of the 1,515 identified children aged 6 - 16 who were injured or killed were identified in 256 school transport events. The predominant reason for being killed or injured when travelling on school transportation was when children were outside the bus (74%), either when passing the bus to cross the street, running in front of the bus (21%) or behind the bus (30%). Contrary to the general belief that children older than 12 are mature enough to handle traffic, more than 50% of the fatal injuries in Sweden affected children aged 13 –16. Similar results were found in the UK. The afternoon school journeys, pedestrians after alighting from the bus, and those in situations that deviated from their normal routine were found to be particularly vulnerable. Conclusions The travel chain perspective/or door to door perspective offers a promising approach for understanding school transport risks and for identifying effective countermeasures; including around bus stops and on the way to/from the bus stop. Data collection needs to be revised to reflect this approach.
|
|
| 8. |
- Anund, Anna, et al.
(författare)
-
Piloting smart safe school bus : exploration of security gains from implementation of a driver support system, additional technical equipment and intelligent bus stops
- 2010
-
Ingår i: European Transport Research Review. - Berlin : Springer. - 1867-0717 .- 1866-8887. ; 2:3, s. 157-163
-
Tidskriftsartikel (refereegranskat)abstract
- Purpose: Road crash statistics reveal that school children are frequent victims and the most risky situation is when the child is outside the bus. The aim of this pilot study was to explore possible changes in speed, implementation of routines, hazard detection and child security gains from a driver support system integrated with intelligent bus stops and additional technical equipment.Methods: In total, 130 children with transmitters were using two specially equipped busses and bus stops. Speed of oncoming and overtaking cars, implementation of routines, the possibilities to discover potential hazards and experienced stress in the children were analysed by speed measurements, diary notes, questionnaires and focus group interviews.Results: This pilot study exploration showed that the speeds of other road users were reduced at one of two bus stops. The driver support system was frequently used in all its parts and was considered useful by the bus drivers. It also raised the level of routines and allowed the drivers to survey the children. Children reported feeling more secure with the system running and experienced less stress as a consequence of it.Conclusion: This pilot study shows that the evaluated systems may have the ability to reduce speed of other road users, raise the level of routines and make children feel more secure. Further studies are needed that apply a holistic approach on school transportation safety and security.
|
|
| 9. |
- Anund, Anna, 1964-, et al.
(författare)
-
The severity of driver fatigue in terms of line crossing : a pilot study comparing day- and night time driving in simulator
- 2017
-
Ingår i: European Transport Research Review. - : Springer Verlag. - 1867-0717 .- 1866-8887. ; 9:2
-
Tidskriftsartikel (refereegranskat)abstract
- Introduction: The overall aim of this study is to compare day-time driving with night-time driving looking at line crossings during self-reported sleepiness and long blinks. The hypothesis is that high levels of self-reported sleepiness (KSS 9) and long blink duration (>0.15 s) will be less associated with critical events during the day-time compared to night-time.Method: The study is based on data from a driving simulator experiment with 16 participants driving 150 km on a typical Swedish motorway scenario twice: once during daytime and once during night time. In total data from 6 segments of 4 km each equally distributed along the drive was averaged and included in the analysis. A Mixed Model Anova was used to test the effects on KSS, Blink Duration and Line Crossings with factors for Session (Day/Night) and Road segment (1–6), and participant as random. In addition, a logistic regression was used to identify when there is a risk for line crossings. Finally, the proportion of line crossings in relation to high KSS values and long blink durations was tested with Fisher’s exact test.Results: The results show no differences in the percentage of Line Crossings to the left during high levels of Karolinska Sleepiness Scale during daytime (33%) compare to night-time (40%). However, there was a significant difference between day and night time line crossings while the driver had long duration blinks (4% during daytime and 35% during night-time). Despite these results the most promising predictor of line crossings in each segment of 4 km/h was KSS with an Odds Ratio of 5.4 with a reference value at Karolinska Sleepiness Scale level 5.Conclusion: In conclusion, the results do not support the hypothesis that high levels of KSS will result in more frequent line crossings at night time compared to day time. However, the result supports the hypothesis that long blink durations are associated with more line crossings when they appear during night time than during daytime. © 2017, The Author(s).
|
|
| 10. |
- Bellone, Mauro, 1982, et al.
(författare)
-
A cross-country comparison of user experience of public autonomous transport
- 2021
-
Ingår i: European Transport Research Review. - : Springer Science and Business Media LLC. - 1867-0717 .- 1866-8887. ; 13:1
-
Tidskriftsartikel (refereegranskat)abstract
- Autonomous solutions for transportation are emerging worldwide, and one of the sectors that will benefit the most from these solutions is the public transport by shifting toward the new paradigm of Mobility as a Service (MaaS). Densely populated areas cannot afford an increase in individual transportation due to space limitation, congestion, and pollution. Working towards more effective and inclusive mobility in public areas, this paper compares user experiences of autonomous public transport across Baltic countries, with the final goal of gaining an increased insight into public needs. User experience was evaluated through questionnaires gathered along pilot projects implementing a public transportation line, using an automated electric minibus between 2018 and 2019. To have sufficient diversity in the data, the pilot projects were implemented in several cities in the Baltic Sea Area. The data analysed in this paper specifically refer to the cities of Helsinki (Finland), Tallinn (Estonia), Kongsberg (Norway), and Gdańsk (Poland). Across all cities, passengers provided remarkably positive feedback regarding personal security and safety onboard. The overall feedback, which was very positive in general, showed statistically significant differences across the groups of cities (Kongsberg, Helsinki, Tallinn and Gdansk), partially explicable by the differences in the route design. In addition, across all cities and feedback topics, males gave a lower score compared to females. The overall rating suggests that there is a demand for future last-mile automated services that could be integrated with the MaaS concept, although demand changes according to socio-economic and location-based conditions across different countries.
|
|
