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Stockholm bypass tunnel – merging traffic study: technical report
Swedish National Road and Transport Research Institute, Traffic and road users, Human-vehicle-transport system interaction.
Swedish National Road and Transport Research Institute, Traffic and road users, Human-vehicle-transport system interaction.
2014 (English)Report (Other academic)
Abstract [en]

The Stockholm bypass (Förbifart Stockholm) project is a new road project that will create a bypass of central Stockholm. The entire project includes motorways, bridges and two tunnels, one of which will be 16.5 km. The Stockholm bypass is the largest infrastructure project in Sweden to date. When the road is in a tunnel, and especially in a long tunnel, maintaining the highest possible level of safety is paramount. The present report describes a simulator study on the merging of traffic from entry-ramps into the main tunnel. The study focused upon the specific situation of driving down the entry-ramps and entering (merging) into the main tunnel with a special emphasis on measures of safety and driving performance. A group of 21 test drivers, 11 males and 10 females, participated in the study. They were instructed to drive a series of test scenarios in a 3D-model of the Stockholm bypass tunnel in the VTI driving simulator III. There was simulated traffic in the main tunnel to improve the realism. Two relatively small gap sizes between vehicles in the main tunnel were used, representing gape sizes that road users can observe on a daily basis when using the E4 motorway through Stockholm. Driving performance (speed, time headway, vehicle position, and distance to tunnel wall) and the test drivers’ experiences of the driving task were measured. The main results of the study suggest that the merging zones were too short for some of the drivers to merge comfortably and safely. The merging zones are found at the point where the entry-ramp tunnels merge with the main motorway tunnel and comprise an observation section, an adjustment section and a completion section. The distance-to-wall results for the Vinsta ramp (0.5 km) with heavy traffic are particularly concerning from a road traffic safety perspective because more than 25 % of the drivers completed the merging manoeuvre with less than two seconds of time headway remaining before the end of the completion section.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2014. , 39 p.
ViP publication: ViP - Virtual Prototyping and Assessment by Simulation, 2014-3
Keyword [en]
Tunnel, Access road, Merging traffic, Motorway, Geometric design, Headway, Driver, Behaviour, Mental load, Driving (veh), Simulator (driving), Test
National Category
Infrastructure Engineering
Research subject
30 Road: Highway design, 31 Road: Geometric design; 80 Road: Traffic safety and accidents, 841 Road: Road user behaviour
URN: urn:nbn:se:vti:diva-6930OAI: diva2:734226
Available from: 2014-07-15 Created: 2014-07-15 Last updated: 2016-02-05Bibliographically approved

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