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Adaptation Evaluation: An Adaptive Cruise Control (ACC) System Used by Drivers with Lower Limb Disabilities
Swedish National Road and Transport Research Institute.ORCID iD: 0000-0003-2301-5793
2001 (English)In: IATSS Research, ISSN 0386-1112, Vol. 25, no 1, 51-60 p.Article in journal (Refereed) Published
Abstract [en]

Twenty subjects with lower limb disabilities participated in a simulator study. The purpose of the study was to investigate how an Adaptive Cruise Control (ACC) system together with two different hand controls for accelerator and brake influenced workload, comfort and driving behaviour and to further develop a method to evaluate vehicle adaptations for drivers with disabilities. The installed ACC system could maintain a constant speed selected and set by the driver and it also adapted speed in order to keep a safe distance to a leading vehicle. Furthermore, it included a stop-and-go function. Two common types of hand controls for accelerator and brake were used. The hand controls were different both with respect to function, single or dual levers, and position, on the steering column or between the front seats. The subjects were all experienced drivers of adapted cars equipped with hand controls. All subjects drove 100km at two occasions, with and without the ACC system available but with the same hand control. Subjective workload was found to be significantly lower and performance better for the ACC condition. The difference in speed variation between manual and ACC supported driving increased with the distance driven which seems to support the previous finding. The subjects thought they could control both speed and distance to leading vehicles better while the ACC was available. ACC driving did not influence reaction time, speed level, lateral position or variation in lateral position. Headway during car following situations was shorter for the ACC condition compared to manual driving. The ACC was well received, trusted and wanted. It was concluded that the ACC system substantially decreased workload, increased comfort and did not influence safety negatively. The only difference found between the two types of hand controls was that drivers using the dual lever system had less variation in lateral position. The applied evaluation method proved to be useful but needs to be further developed.

Place, publisher, year, edition, pages
2001. Vol. 25, no 1, 51-60 p.
Keyword [en]
Disabled person, Driver, Adaptive cruise control, Car, Adaptation, Driving controls, Mental load, Fatigue, Attitude, Simulator, Test
National Category
Vehicle Engineering
Research subject
80 Road: Traffic safety and accidents, 841 Road: Road user behaviour; 90 Road: Vehicles and vehicle technology, 911 Road: Components of the vehicle; 90 Road: Vehicles and vehicle technology, 914 Road: ITS och vehicle technology
Identifiers
URN: urn:nbn:se:vti:diva-7834DOI: 10.1016/S0386-1112(14)60006-6OAI: oai:DiVA.org:vti-7834DiVA: diva2:809448
Available from: 2015-05-04 Created: 2015-05-04 Last updated: 2015-05-04Bibliographically approved
In thesis
1. Evaluation of Adapted Passenger Cars for Drivers with Physical Disabilities
Open this publication in new window or tab >>Evaluation of Adapted Passenger Cars for Drivers with Physical Disabilities
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Driving can provide independent and efficient mobility. However, according to the driving license directive (91/439/EEC) are persons with locomotor impairments are only allowed drive if their disabilities can be compensated. Compensation can be realised by vehicle adaptations. The directive provides meagre guidance on how vehicles should be adapted or how to verify that the compensatory requirements are fulfilled. This is a gap in the current process for licensing drivers with physical disabilities. Furthermore, the Swedish process from driver assessment to driver licensing and adaptation approval is complex, fragmented, and suffer from lack of communication between involved authorities. The objective of this thesis was to contribute to the development of a method to evaluate vehicle adaptations for driver with physical disabilities. The focus was on the evaluation of adaptations for steering, accelerating and braking. Three driving simulator experiments and one manoeuvre test with adapted vehicles were conducted. A group of drivers with tetraplegia driving with hand controls were compared to able-bodied drivers in the first experiment. Even if the drivers with tetraplegia had a longer brake reaction time they performed comparable to the able-bodied drivers. However, they spent more effort and were more tired in order to perform as well as the able-bodied drivers. It was concluded that the adaptation was not sufficient. An Adaptive Cruise Controller (ACC) was tested in the second experiment in order to find out if it could alleviate the load on drivers using hand controls. It was found that the ACC decreased the workload on the drivers. However, ACC systems need to be adjustable and better integrated. The results from the first two experiments were used to provide some guidelines for ACCsystems to be used by drivers with disabilities. The third experiment was preceded by a manoeuvre test with joystick controlled cars. The test revealed some problems, which were attributed to time lags, control interference, and lack of feedback. Four joystick designs were tested with a group of drivers with tetraplegia in the third experiment. It was concluded that time lags should be made similar to what is found in standard cars. Lateral and longitudinal control should be separated. Active feedback can improve vehicle control but should be individually adjusted. The experiments revealed that drivers with the same diagnose can be functionally very diverse. Thus, an adaptation evaluation should be made individually. Furthermore, the evaluation should include a manoeuvre test. Finally, it was concluded that the evaluation approach applied in the experiments was relevant but needs to be further developed.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2004
Series
Linköping Studies in Science and Technology, ISSN 0345-7524 ; 864
Keyword
Disabled person, Driver, Car, Adaptation, Equipment, Vehicle handling, Simulator, Adaptive cruise control, Driving aptitude, Thesis
National Category
Vehicle Engineering
Research subject
90 Road: Vehicles and vehicle technology, 911 Road: Components of the vehicle; 80 Road: Traffic safety and accidents, 841 Road: Road user behaviour; 80 Road: Traffic safety and accidents, 84 Road: Road users
Identifiers
urn:nbn:se:vti:diva-7838 (URN)91-7373-911-1 (ISBN)
Available from: 2015-05-04 Created: 2015-05-04 Last updated: 2015-05-04Bibliographically approved

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