The popularity of Bus Rapid Transit (BRT) has been growing rapidly over the past years, where more and more cities add BRT to their public transport systems. Roundabouts are also growing and are popular intersection designs because they are one of the safest types of intersections and improve traffic flow. It is, therefore, likely that in some cities a BRT route will go through a roundabout.
To keep the priority of BRT and the safety effects of a roundabout, the evaluation of roundabouts with BRT based on safety and level of service (performance) of all modes is investigated. Some countries have already developed and built solutions for roundabouts with BRT, where the priority of the buses can differ. One solution, often called throughabouts, is where the exclusive bus lanes go through the centre island of the roundabout, giving full priority to the buses. However, few guidelines have been developed on roundabout solutions with BRT and there seems to be a disagreement about the effectiveness of these types between some countries.
This thesis aims to reduce this research gap by developing an evaluation methodology that compares and evaluates different design solutions of roundabouts with BRT based on the safety and level of service of all modes. The evaluation methodology is also able to determine which design solution is the most optimal.
The methods used to compare and evaluate the designs in the methodology are literature review, multicriteria analysis (MCA), microsimulations and calculations, and a case study.
A case study of a roundabout in Reykjavik, Iceland is used to illustrate and test the methodology. Three design solutions are compared and evaluated where the priority configuration of the BRT is changed for each design. Design 1 is a regular roundabout where the buses drive through the intersection in mixed traffic. Design 2 is a throughabout where there are traffic signals for all entering traffic, and design 3 is a throughabout where there are traffic signals for the conflicting traffic. These designs are evaluated based on the traffic performance indicators of total throughput, travel time, and variation in travel time, and the safety indicators of number and types of conflicts for vehicle – vehicle conflicts and active mode – vehicle conflicts, and costs. These indicators are obtained by the output of a VISSIM model and using SSAM for the safety calculations. MCA is used to compare and evaluate the designs.
This results in that throughabouts with traffic signals for conflicting traffic prove to be the most optimal designs for roundabouts with BRT. They are also both the safest and best performing design solution.
This thesis addresses the research gap of disagreement of the effectiveness of the roundabouts by showing that throughabouts are effective, however, to determine their full effectiveness, further research is recommended on comparing throughabouts with other types of intersections. This thesis developed an evaluation methodology which can be used to evaluate and compare different design solutions which can be used to decide which design is the most optimal for intersections. ... Read more

Covid-19 has had a major impact on mobility and especially on public transportation. In the Netherlands, the impact on public transport usage reduced up to 90% per day during the Covid-19 crisis compared to 2019. In June 2021, when travelling by public transport was allowed again, the usage was only half compared to a similar weekday in 2019. To gain information on current and expected future travel behaviour, Nederlandse Spoorwegen (NS) and Delft University of Technology (TU Delft) organized longitudinal surveys in April 2020, June 2020, September 2020, December 2020, April 2021, and September 2021. These surveys give quantitative insights on current and future travel behaviour that help restore and redesign public transport properly after the Covid-19 pandemic.
This project focused on the effects of anxiety on train travelling behaviour during and after Covid-19. The main purpose of this project was to investigate the group of anxious train travellers during Covid19 and gain more insight into this group, their characteristics, behaviour, and attitude. The main factors and characteristics that influenced anxiety levels were age, gender, and vaccination status. These factors are in line with literature from other countries on anxiety in public transportation during Covid-19. A typical profile of an anxious person is a female, older than 25 years old and not vaccinated. Since attitude already has a strong relationship with travel behaviour, the anxious group was compared to the not anxious group to investigate the effects of anxiety on travel behaviour and attitude. The results show that anxiety has a negative effect on attitude which leads to less usage, both current and expected usage in the future. Anxious people tend to generally have a negative attitude towards the train, while not anxious people generally have a positive attitude towards the train. In current train travelling behaviour, anxiety has the effect of people travelling less, and more people are likely to not travel at all. For future expected travel, anxious people are more likely to plan to travel less than not anxious people.
The number of anxious people fluctuates over time and seems to be related to the number of cases or hospitalizations. The number of anxious people was higher when there were peaks in number of cases and hospitalizations, and lower when things were calmer. During the first year (April 2020 to April 2021), the anxious group had been over and around 40% of train travellers. It can be assumed that there will still be a group of people that are anxious after the pandemic, because in September 2021, when cases had been low for some time, there was a group of people still feeling very anxious. The results of this paper helped identify the anxious group and established the effect of anxiety on attitude and behaviour, which helps for designing timetables and planning rolling stock purchases.
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