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- Hjälmdahl, Magnus, et al.
(author)
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Speed Regulation by in-car active Accelerator pedal – effects on speed and speed distribution
- 2002
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In: IATSS Research. - 0386-1112. ; , s. 60-66
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Journal article (peer-reviewed)abstract
- The effects on speeds and speed distribution were studied in a large scale field trial with an in car system for speed adaptation in the city of Lund, Sweden. In the trial 290 vehicles were equipped with an "active accelerator pedal" and data logger for a period of 3-11 months. Data was logged in each test vehicle during the whole trial and was analyzed for 3 one-month periods: Before activating the system, after short time use and after long time use. The results showed significant reductions in the speed level. Speeds on stretches decreased statistically significantly (p<0.05) at 60 out of 69 observed sections. The effects were largest on arterial roads, at mid-block sections, where the prevailing traffic conditions and street design allows higher speeds. The standard deviation decreased on all arterial roads, mainly due to the decrease in speed of the fastest vehicles but there is also an effect from an increase in speed of the slowest vehicles. On streets with mixed traffic no differences in speed or speed distribution could be shown. This is most likely due to the fact that speeds were already controlled by the prevailing traffic conditions and they already were so low that the system never had to interfere. Further research is needed in order to investigate possible behavioral adaptation effects when the system is active as well as inactive and how driver behavior would be influenced in a situation where a large part of the vehicle fleet equipped with an active accelerator pedal.
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| 2. |
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| 3. |
- Varhelyi, Andras, et al.
(author)
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State of the art of sensor technology
- 2004
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Reports (other academic/artistic)abstract
- Literature surveys, limited to the sensor technologies applicable for the functionalities of relevance for the “Safe Speed” and “Safe Distance” concept, were conducted on recent and undergoing development in the area of sensor technology. Various alternatives of combinations of sensors can serve for building the prototype for the Safe Speed and Safe Distance concept. However, one sensor alone can not fulfill the expectations. Information from various sensors taken together can improve reliability and redundancy of the information for safety critical situations. In order to get a better picture of the environment in front of the vehicle Data Fusion is needed involving the merging of the information provided by different sensors.
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| 4. |
- Varhelyi, Andras, et al.
(author)
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The effects of Large Scale use of active accelerator pedal in urban areas
- 2002
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In: [Host publication title missing].
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Conference paper (peer-reviewed)abstract
- Within the framework of the Swedish national trial with Intelligent Speed Adaptation (ISA) in urban areas, the effects of large scale use of “active accelerator” were evaluated. 284 cars were equipped with the system for a period of 5-11 months in the city of Lund. The driving data of all equipped vehicles were logged with regard to time and speed, both before and after activating the system. Driver behaviour and workload were studied with the help of an instrumented vehicle. Possible system effects, such as speeds, interactions with other road-users and driving against red were studied in the field. Possible changes in driver attitudes and acceptance were studied by interviews. The results revealed that test drivers’ compliance with the speed limits increased both according to their own statements and objective measurements. At this stage practically no negative compensatory effects could be found.
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