Telematic controlled measures to increase the traffic flow quality at construction sites with lane drop offs on motorways
Abstract
This feasibility study deals with the traffic flow at highway construction sites with lane drops. Its objective is to identify factors that influence the traffic flow and to develop condition-responsive measures to increase capacity and safety. The statutory framework and regulations are analysed. The state of the art is surveyed in an international literature review. Measurements were conducted to test several measures. For this purpose velocity, time and vehicle length were measured in multiple cross sections. To analyse traffic behaviour and interactions between drivers the weaving area was also videotaped. The most important findings are: · A speed limit of 60 km/h can maintain flowing traffic conditions slightly longer than a speed limit of 80 km/h. · A speed funnel can delay the beginning of congestion distinctly. Therefore it is appropriate to survey the application of a speed funnel in an on-road test. · In case of flowing traffic with higher speeds it is favourable that drivers change lane previous to the lane drop. So a longer area (some 100 meters) can be used for merging and drivers can find a sufficient gap by moderate speed positively. · Under congested conditions the highest capacity can be obtained, if the ending lane is used until its very end. Alternate merging affects the capacity advantageously. On the basis of these findings an information system was developed, which consists of different signals, three sensors and a control unit. On the basis of the estimated benefits it is recommended to follow the direction of survey: For a high effectiveness of the information transmission different embodiments and texts should be put to a on-road test. In a next step the proposed system should be assigned to and tested at sites with long-term lane drops and expanded by a dynamic speed funnel.
motorway construction site traffic flow telematic lane drop off
Publikationen
Verkehrstelematisch gesteuerte Maßnahmen zur Erhöhung der Verkehrsflussqualität bei baustellenbedingter Fahrstreifensubtraktion auf Autobahnen (EVA)
Autoren: Sammer, G., Mensik, K., Feßl, T. Jahr: 2004
Forschungsbericht (extern. Auftraggeber)
Dynamisches Verflechtungskonzept für Fahrstreifensperren auf Autobahnen
Autoren: Mensik, Karl Jahr: 2006
Journal articles
Project staff
Gerd Sammer
O.Univ.Prof. Dipl.-Ing. Dr.techn. Gerd Sammer
gerd.sammer@boku.ac.at
Tel: +43 1 47654-85635
Project Leader
01.08.2003 - 29.02.2004
BOKU partners
External partners
Austrian Road Safety Board, Inst. of Traffic Engineering and Accident Statistics
none
partner
Autobahnen- und Schnellstraßen-Finanzierungs-Aktiengesellschaft
none
partner