Multi-criterion Assessment of Level Intersections in Urban Areas
J Hradil, M Uhlík, CTU in Prague, CZ
The paper deals with the problems of multi-criterion assessment of level intersections in urban areas.
The paper deals with the problems of multi-criterion assessment of level intersections in urban areas. The selection of a intersection is presently very frequently led by the investor’s preference for a specific solution aimed e.g. at the minimization of construction costs; doing so it may relatively often happen that the suggested solution is far from the ideal one. By means of a suitably applied multi-criterion assessment, based on the technical parameters of individual types of intersections and their impact on their surroundings, the most suitable solution may be defined, including the quantification of indirect costs for the whole service life of the intersection. The prepared methodology will be applicable not only for designers, but within preliminary assessment also for the investor and for the state administration bodies who either act to approve the suggested solution or are directly in the investor’s role. The presumed advantage of the methodology consists in its universal concept and applicability not only in the conditions of the Czech Republic, but also abroad as the methodology is designed as an open system allowing potential modifications of individual criteria, weights and prices.
In the first part of the paper, the basic criteria to be assessed are defined, including the determination of their significance level and the definition of their impacts on the assessment as a whole.
They include in particular the following:
- Configuration of accessible spaces and building arrangement of their surroundings
- Sight parameters
- Parameters of individual intersection legs
- Vehicle volumes and their distribution in individual intersection legs
- Traffic flow composition (percentage of freight vehicles)
- Ecological influence on the surroundings – traffic fumes
- Noise pollution
- Pedestrian traffic occurrence – pedestrian crossings
- Cycle traffic occurrence
- Rail traffic occurrence
- Operating costs
- Building costs
Each of the criteria above obviously cannot be assessed separately of the others as, apart from the impact on the entire assessment within the multi-criterion assessment, individual criteria also develop their respective mutual dependences (e.g. volumes – noise pollution) to which the evaluation of individual criteria and their weights within the resulting methodology must be adapted. The methodology is primarily oriented towards significant transportation engineering characteristics, i.e. the effort to achieve maximum safety preserving the sufficient capacity of the intersection. While weighting individual parameters the traffic significance of the assessed intersection must naturally also be put into consideration.
This part also briefly defines individual commonly used multi-criterion assessment methodologies which will become the basis for the resulting methodology. .
Using the selected methodologies and preliminarily proposed weights of individual criteria, the second part presents an experimental in-situ assessment of a real intersection. The chosen intersection was monitored by traffic surveys and measurements to specify its building parameters and also the existing traffic volumes. This particular intersection was subsequently modelled in the Aimsun software to define its capacity limit. The same modelling-based procedure was also applied for individual alternatives of the new layout of the solved intersection to allow the specification of the intersection type effect on its capacity. The achieved results will serve for the determination of a suitable multi-criterion assessment methodology, and also for the relevant model gauging, i.e. evaluation of individual criteria and the determination of their respective weights.
Association for European Transport