Vehicle design and roundabouts
A roundabout is a type of road junction in which traffic moves in one direction (counterclockwise in right-hand traffic countries such as Sweden) around a central island. During the several last decades, roundabouts have become a very popular traffic solution because of their superiority over classical intersections in several aspects. The construction of a roundabout improves safety (a vast reduction of accidents especially fatal ones) and operations (reduced congestion and delays), brings lower maintenance costs (no signal hardware or equipment maintenance), reduces pollution (less noise and better air quality due to lower fuel consumption), and improves the aesthetics of a junction. In this project, the focus is on traffic flow in roundabouts, especially on gap acceptance that dictates traffic operations.
Given that the driver of an entering vehicle looks for a gap in circulating traffic, it is important, especially in heavy traffic, to observe on time if the vehicle in the roundabout signals an intention to exit. Therefore, the aim of this project is to examine whether the geometrical visibility of the front direction-indicator lamps could have any effect on traffic flow in roundabouts.
Two methods will be applied. In the first part of the project, the task includes the development of camera-based system for mapping the geometrical visibility of the front direction-indicator lamps in a 3D space. The measurements will be done on a selected number of real vehicles. The second part of the project includes computer simulation using models of a selected number of real roundabouts in Sweden, and the data collected in the first part of the project.
Qualifications and conditions for the project
Two motivated students should apply for this Master thesis project. The students should have good knowledge of Matlab. The duration of the project is up to one year. After the successful completion of the project, the students will receive 30 or 60 credit points depending on the work duration.
6.5.5. Geometric visibility
126.96.36.199. Horizontal angles (see figure below)
Vertical angles: 15o above and below the horizontal for direction-indicator lamps of categories 1, 1a, 1b, 2a, 2b and 5. The vertical angle below the horizontal may be reduced to 5o if the lamps are less than 750 mm above the ground; 30o above and 5o below the horizontal for direction-indicator lamps of category 6. The vertical angle above the horizontal may be reduced to 5o if the optional lamps are not less than 2,100 mm above the ground.
For M1 and N1 category vehicles, the value of 45o inward for the direction-indicator lamps of categories 1, 1a or 1b, whose lower edge of the apparent surface is less then 750 mm above the ground, may be reduced to 20o under the horizontal plane containing the reference axis of this lamp.
Uppdaterad: 01 februari 2012
Ansvarig för sidan: Christian Johansson