Overview
The objective of the project is to recognise the essential relationships between the elements of the structural and operational design of the transition area before the construction site and the characteristics of the traffic flow at different construction types on HLS and assessment of the impact on traffic flow and therefore on road safety. Further aim of the project is the derivation of principles and recommendations for local purposeful design of the transition areas before HLS construction sites in various types of operation.
The analysis of existing VSS standards for establishment and operation of construction sites on high streets revealed several shortcomings. In connection with the recommended improvements is also encouraged to reconsider the standardization concept. Speak the measures proposed in this work additional studies on the issue focusing on "entrances and exits at the construction site Interior" and "roadworks" for this new concept.
Funding
Results
These are results of the project:
- Final report: "construction of high-performance roads; Transport Technical measures to improve safety and traffic flow ", research contract VSS 199/127, IVT ETHZ, Zurich, August 2005
- Conference paper STRC 2001 'Travel behavior and accidents in the field of highway construction sites, "1st Swiss Transport Research Conference Monte Verità / Ascona, March 2001
- Various interim reports for the accompanying Commission
The outputs of this work are the recognition of the essential relationships between the elements of the structural and operational design of the transition area before the construction site and the characteristics of the traffic flow at different construction types to high-performance roads (HLS) and the assessment of the impact on traffic flow and therefore on road safety. T
his principles and recommendations for local purposeful design of super-junction regions before HLS construction sites are to be derived in various types of operation.
To this end, documents relating to the previous highway construction sites as well as the technical literature are evaluated and carried out surveys in selected construction site areas. The measurements focused on the transition areas between the open road and the construction site.
With a combined use of different measuring devices the following variables are recorded and evaluated: speed and time gaps of individual vehicles per lane at the decisive cross-sections, speed profiles along the construction area, load curves of traffic flow (volume / density / speed), frequency and location of lane changing.
Based on the analysis of surveys of traffic flow as well as the accident took a Measure Catalogue to improve the site equipment and the design of the over-traffic areas will be developed for the specified operating modes.
During investigation focus on entrances and exits in the building site interior has been found in the present research, that these generally lead to increased accidents. However, the data sample was limited and detailed accident analyzes were not possible. In the meantime, an extensive and detailed data-collection could be the preparation of all accidents at highway construction sites for several years with the Zurich cantonal police. It is recommended, based on these records to conduct a study to work out with the aim to clarify the circumstances and possible causes of black spots and corresponding recommen