Trafiksimulering av E20 Ribbingsberg–Vara: En simuleringsstudie av framkomlighet för en mötesfri utformning av E20


The part of road E20 between Ribbingsberg and Vara in Sweden will be converted from a two-lane rural road with speed limit 80 kilometers per hour into an oncoming separated highway with speed limit 100 kilometer per hour. The suggested design of the oncoming separated highway includes sections of 1+1 and 2+2 lanes with varying lengths between 1.6 and 3.2 kilometers. Due to the current high level of traffic demand in combination with high levels of trucks, the traffic performance at the suggested design could be questioned. In order to evaluate traffic performance, a traffic simulation study has been performed for the peak hour during a typical weekday. The study includes three different scenarios of traffic demand, representing levels of year 2015, 2025 and 2045. Simulations are performed using the microscopic simulation model RuTSim (Rural road Traffic Simulator), developed by VTI and customized for rural traffic. The model is calibrated using measurements from the actual road stretch in combination with data from the adjacent oncoming separated highway with speed limit 100 kilometers per hour between Vara and Skara. Simulation of year 2045 generates average speed for cars of 94 kilometers per hour. Sensitivity analysis of limited overtaking willingness results in average speed as minimum 92 kilometers per hour.

This means that the traffic performance fulfills the condition according to Trafikverkets former requirement that the average speed for cars should not be less than 10 kilometers per hour below the speed limit (100 kilometer per hour). The share of constrained vehicles also supports the conclusion of a design with satisfying traffic performance. It should though be mentioned that the lengths of the twolane segments within the suggested design exceeds the recommendations according to Trafikverket



Open seminar with Mistra SAMS international scientific advisory...

Mistra SAMS international scientific advisory panel (ISAP) is visiting Stockholm, and the program will host an open seminar where the panel members will give talks in their area of expertise.

ERPUG 2017

The five year anniversary of  European Road Profile Users' Group (ERPUG) Forum will take place at Ramboll head quarter, Copenhagen, Denmark October 19-20, 2017. 



Vehicle Driver Monitoring: sleepiness and cognitive load

To prevent road crashes it is important to understand driver related contributing factors, which have been suggested to be the critical reason in 94 per cent of crashes. The overall aim of the project Vehicle Driver Monitoring has been to advance the...


Tomas Svensson new director-general

Tomas Svensson was today appointed Director-General of VTI. Tomas has been acting Director-General since January 2017. 


Crash testing bicycles at VTI

For the first time single bicycle crashes have been simulated at the VTI crash safety laboratory.


A case study exploring firefighters’ and municipal officials’ preparedness for electrical vehicles

A VTI-study presents a social perspective on new vehicle technology. It explores the self-reported preparedness of the fire departments (i.e., rescue services) in Sweden’s three largest cities regarding rescue operations involving electrical vehicles (EVs).


Pioneering research on and about bicycles at VTI

Under what circumstances might cyclists lose tyre grip? What actions could then be taken to prevent a crash? VTI is currently developing a theoretical model of the behaviour of bicycle tyres during braking and steering in different situations and on different...


Virtual pedestrians create efficient stations

If more people are to choose sustainable travel, then the public transport stations of the future must be designed so that pedestrians can get where they are going quickly, without congestion or queues. The Swedish Road and Transport Research Institute (VTI)...