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Helmers, Gabriel
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Publications (10 of 54) Show all publications
Nygårdhs, S. & Helmers, G. (2007). VMS - Variable Message Signs: A literature review. Linköping: Statens väg- och transportforskningsinstitut
Open this publication in new window or tab >>VMS - Variable Message Signs: A literature review
2007 (English)Report (Other academic)
Abstract [sv]

This literature review is primarily aimed at describing studies that deal with the interaction between driver behaviour and variable message signs, VMS. The collected references are, for the most part, published in Europe or studies about European conditions, published during the years of 2000-2005. Areas treated in the study are effects on driver behaviour, driver attitudes, design, understanding and recall of VMS, and accidents and regulations concerning VMS. The literature review is supplemented by a behavioural background and recommendations from a behavioural science perspective.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2007. p. 51
Series
VTI rapport, ISSN 0347-6030 ; 570A
Keywords
Variable message sign, Driver, Behaviour, Design, Comprehension, Legibility, Speed limit, Warning, Driver information
National Category
Infrastructure Engineering
Research subject
Road: Traffic engineering, Road: Traffic control and traffic information
Identifiers
urn:nbn:se:vti:diva-6423 (URN)
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2014-09-19Bibliographically approved
Helmers, G. & Törnros, J. (2006). Effekt av övergångskurvor på förares säkerhetsmarginal samt inverkan av träning: ett försök i körsimulator. Linköping: VTI., VTI rapport 501
Open this publication in new window or tab >>Effekt av övergångskurvor på förares säkerhetsmarginal samt inverkan av träning: ett försök i körsimulator
2006 (Swedish)Report (Other academic)
Alternative title[en]
Effect of transition curves on drivers' safety margin and the influence of training - an experiment in a driving simulator
Abstract [sv]

Sharp curves constitute a significant safety risk. The question is if it is possible to design sharp curves in such a way that drivers pass them with greater safety margins? In this work we studied the effect of transition curves (in the form of clothoides) added to the constant radius curve segment on drivers´ choice of speed and maximal lateral acceleration. The study was carried out in VTI´s driving simulator II. Influence on the results of the subjects´ experience and training in driving the simulator was studied by repetition of the first experimental session for all subjects on each of the following two working days. The results showed, firstly, that the drivers chose higher speeds in curves with clothoides, secondly, that there was no difference in maximal lateral acceleration, and finally, that these results were not influenced by training.

Place, publisher, year, edition, pages
Linköping: VTI., VTI rapport 501, 2006. p. 38
Series
VTI rapport, ISSN 0347-6030
Keywords
Driver, Behaviour, Transition curve, Curve, Degree of curvature, Speed, Acceleration, Simulator, Test
Research subject
Road: Traffic safety and accidents, Road: Road user behaviour; Road: Traffic safety and accidents, Road: Geometric design and traffic safety
Identifiers
urn:nbn:se:vti:diva-6393 (URN)
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2013-12-03
Törnros, J., Dahlstedt, S. & Helmers, G. (2006). Spontant hastighetsval i olika trafikmiljöer i tätort. Linköping: VTI., VTI notat 9-2006
Open this publication in new window or tab >>Spontant hastighetsval i olika trafikmiljöer i tätort
2006 (Swedish)Report (Other academic)
Abstract [sv]

Car drivers' spontaneous speed choice in urban areas was studied and compared with posted speed limits. Two groups of middle-aged men, experienced car drivers, participated in the study. One group consisted of thirteen drivers with at least five years experience of car driving in Linköping. The other group consisted of eight drivers with very little experience of car driving in Linköping. The participants drove a pre-determined test route in the city of Linköping four times with covered speedometer. The total driving distance was 96 km. The participants were alone in the car during driving. Route guidance was given during the drive, both verbally and visually. The location and timing of the guidance were controlled by a GPS-based computer. Before the test drive the participants were instructed to drive as they normally do without stress. The participants' speed (75th percentile) for each of the route sections and for each of the four drives was measured and analysed. After completion of the test the participants rated some of the route sections. The measured speed varied substantially between route sections (traffic environments). However, the agreement between measured speeds across route sections was large between as well as within individuals. Along some route sections the speed was higher, and along others it was lower, than the posted speed limit. The speed variation across traffic environments (route sections) can to a large extent be explained by the variation between the traffic environments and to a much less extent by the variation between participants.

Place, publisher, year, edition, pages
Linköping: VTI., VTI notat 9-2006, 2006. p. 82
Series
VTI notat
Keywords
Speed, Choice, Driver, Behaviour, Urban area, Man, Speed limit
Research subject
Road: Traffic safety and accidents, Road: Road user behaviour
Identifiers
urn:nbn:se:vti:diva-1594 (URN)
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2013-12-03
Helmers, G. & Törnros, J. (2004). Effekt på hastighet och sidoacceleration av läget hos rotationscentrum för snäva kurvors skevning samt inverkan av träning: ett försök i körsimulator. Linköping: Statens väg- och transportforskningsinstitut., VTI meddelande 967
Open this publication in new window or tab >>Effekt på hastighet och sidoacceleration av läget hos rotationscentrum för snäva kurvors skevning samt inverkan av träning: ett försök i körsimulator
2004 (Swedish)Report (Other academic)
Alternative title[en]
Effects on vehicle speed and side acceleration related to the location of the centre of rotation for banking of sharp curves, and influence of training : An experiment in a driving simulator
Abstract [sv]

Sharp curves constitute a significant safety risk. The question is if it is

possible to design sharp curves in such a way that drivers pass them with

greater safety margins? In this work we studied if the drivers´ choice of

speed and side acceleration will change with the location of the centre of

rotation for banking of sharp curves. Influence of training was studied by

repetition of the first experimental session during each of the following

three working days for all subjects. The study was carried out in VTI´s

driving simulator (Model I). The results show firstly, that the location of

the centre of rotation for banking of sharp curves influenced the drivers´

choice of speed and side acceleration and secondly, that these results were

not influenced by training.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut., VTI meddelande 967, 2004
Series
VTI meddelande, ISSN 0347-6049
Keywords
Swedish, Sweden, Simulator, Driver, Behaviour, Bend, Degree of curvature, Acceleration, Side, Rotation, Speed, Driver training
Research subject
Road: Traffic safety and accidents, Road: Road user behaviour; Road: Highway design, Road: Geometric design
Identifiers
urn:nbn:se:vti:diva-5148 (URN)
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2013-12-03
Helmers, G., Henriksson, P. & Hakamies-Blomqvist, L. (2004). Trafikmiljö för äldre bilförare: analys och rekommendationer utifrån en litteraturstudie. Linköping: Statens väg- och transportforskningsinstitut., VTI rapport 493
Open this publication in new window or tab >>Trafikmiljö för äldre bilförare: analys och rekommendationer utifrån en litteraturstudie
2004 (Swedish)Report (Other academic)
Alternative title[en]
Traffic environment for older drivers : Analysis and recommendations based on a literature survey
Abstract [sv]

The report begins with a short description of the state of knowledge at

present, and of the age-related functional impairments that affect car

driving. Two explanatory models are described as to why accidents occur.

After that, there is a discussion of what general principles should apply to

simplify the task of driving. The main part of the report consists of a

run-through of the research literature, focusing on the ability of older car

drivers to observe and familiarise themselves in traffic. In that respect,

results and conclusions/recommendations have been presented as regards how

road junctions and roads should be designed, and how the design and location

of signs, traffic signals and road markings should be executed in order that

the requirements of older people may be satisfied. Because only the external

traffic environment has been dealt with in this study, such things as vehicle

design or intelligent transport systems (ITS) solutions in the vehicle itself

are not discussed. In the concluding chapter, some design principles for

roads and elements of the road environment are given, which can be read

independently as the principles apply to all car drivers.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut., VTI rapport 493, 2004
Series
VTI rapport, ISSN 0347-6030
Keywords
Swedish, Sweden, Old people, Driver, Safety, Geometric design, Junction, Traffic sign, Traffic signal, Carriageway marking
Research subject
Road: Traffic safety and accidents, Road: Geometric design and traffic safety
Identifiers
urn:nbn:se:vti:diva-6363 (URN)
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2016-03-07
Herland, L. & Helmers, G. (2002). Cirkulationsplatser - utformning och funktion: svenska och utländska rekommendationer och utformningsregler jämte analys och kommentarer. Linköping: Statens väg- och transportforskningsinstitut., VTI meddelande 895
Open this publication in new window or tab >>Cirkulationsplatser - utformning och funktion: svenska och utländska rekommendationer och utformningsregler jämte analys och kommentarer
2002 (Swedish)Report (Other academic)
Abstract [sv]

This literature review aims to survey Swedish and foreign design solutions to

meet mainly speed

and accessibility requirements of roundabouts and to see if foreign

experiences are relevant for

Swedish conditions. Great importance has also been given to studying to what

extent there are

"functional categories" of roundabouts.

The survey shows that lower speed and single lane in roundabouts improve

traffic safety.

Furthermore that there are good possibilities to control speed through design

e.g. using narrow,

radial entries and exits with small entry radius, entry and exit deflection

to the left, design for an

entry path curvature with small radius and traffic island.

The survey also shows that give way regulations between vulnerable road users

and motor

vehicles in Sweden can be made clearer.

The idea of dividing roundabouts and the entire traffic system into distinct

"functional

categories" is to improve traffic safety by decreasing the risk of the road

user to misunderstand the

situation. To create good categories of roundabouts it ought to be

investigated what is needed and

how it can be mediated to the road user what function category roundabout he

is in. Several

countries have, just as Sweden, a not very pronounced category classification

of roundabouts.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut., VTI meddelande 895, 2002
Series
VTI meddelande, ISSN 0347-6049
Keywords
Swedish, Sweden, Roundabout, Speed, Accessibility, Traffic lane, Safety, Geometric design, Road user, Recommendations
Research subject
Road: Traffic safety and accidents, Road: Geometric design and traffic safety; Road: Highway design, Road: Geometric design
Identifiers
urn:nbn:se:vti:diva-4884 (URN)
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2013-12-03
Helmers, G., Lundkvist, S.-O. & Lauridsen, I. (2001). Åldring av retroreflekterande folier för vägmärken: resultat efter 3 års exponering. Delrapport, mars 2001. Linköping: Statens väg- och transportforskningsinstitut., VTI meddelande 912
Open this publication in new window or tab >>Åldring av retroreflekterande folier för vägmärken: resultat efter 3 års exponering. Delrapport, mars 2001
2001 (Swedish)Report (Other academic)
Abstract [sv]

Projektet genomförs i nordisk samverken inom NMF

(NordiskMörkertrafikForskning). Alla reflex-folier

för vägmärken, som fanns på den nordiska marknaden 1997, har monterats på

identiskt lika

provskyltar som exponeras för trafik utefter landsväg på 9 provplatser:

Damnark 2, Finland 2,

Island 1, Norge 2 och Sverige 2. Provplatserna är valda så att de täcker in

en stor klimatvariation.

Efter "nymätning" vid utsättningen av provskyltarna 1997 görs mätning av

retroreflexionen hos

de rengjorda folierna under sensommaren varje år. Dessa mätningar har under

år 2000 kompletterats

med färgmätningar på ett antal provskyltar.

I rapporten redovisas resultaten efter 3 års exponering.

Projektet fortsätter.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut., VTI meddelande 912, 2001
Series
VTI meddelande, ISSN 0347-6049
Keywords
Swedish, Sweden, Reflectivity, Traffic sign, Sheet, Ageing, Test, In situ, Measurement, Follow up study, Colour
Research subject
Road: Maintenance; Road: Materials, Road: Miscellaneous materials
Identifiers
urn:nbn:se:vti:diva-4857 (URN)
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2013-12-03
Tignor, S. C., Helmers, G. & van der Horst, R. (2000). An international development of a driver-centered guideline for road design. : Statens väg- och transportforskningsinstitut. VTI Konferens
Open this publication in new window or tab >>An international development of a driver-centered guideline for road design
2000 (English)Report (Other (popular science, discussion, etc.))
Place, publisher, year, edition, pages
Statens väg- och transportforskningsinstitut. VTI Konferens, 2000
Series
VTI konferens, ISSN 1104-7267
Keywords
English, Sweden, Conference, Driver, Properties, Behaviour, Highway design, Guidance, Recommendations
Research subject
Road: Traffic safety and accidents, Road: Road user behaviour; Road: Traffic safety and accidents, Road: Geometric design and traffic safety
Identifiers
urn:nbn:se:vti:diva-4776 (URN)
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2013-12-03
Lundkvist, S.-O. & Helmers, G. (1999). Vägmärkens funktion. Linköping: Statens väg- och transportforskningsinstitut., VTI notat 14-1999
Open this publication in new window or tab >>Vägmärkens funktion
1999 (Swedish)Report (Other academic)
Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut., VTI notat 14-1999, 1999
Series
VTI notat
Keywords
Swedish, Reflectivity, Traffic sign, Measurement, Luminance, In situ, Forecast, Properties, Age, Colour, Legibility, Sweden
Research subject
Road: Maintenance
Identifiers
urn:nbn:se:vti:diva-1133 (URN)
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2013-12-03
Helmers, G., Lundkvist, S.-O., Ytterbom, U. & Herland, L. (1999). Vägmärkens sannolika "livslängd" och minsta godtagbara retroreflexion. Linköping: Statens väg- och transportforskningsinstitut., VTI notat 12-1999
Open this publication in new window or tab >>Vägmärkens sannolika "livslängd" och minsta godtagbara retroreflexion
1999 (Swedish)Report (Other (popular science, discussion, etc.))
Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut., VTI notat 12-1999, 1999
Series
VTI notat
Keywords
Swedish, Traffic sign, Durability, Reflectorized material, Minimum, luminance, Measurement, In situ, Sweden
Research subject
Road: Materials, Road: Miscellaneous materials
Identifiers
urn:nbn:se:vti:diva-1135 (URN)
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2013-12-03
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