INFATI
| INFATI | |
|---|---|
| General information | |
| Type: Field operational test | |
| Tested system/service: Intelligent Speed Adaptation | |
| Countries: Denmark | 24 test users |
| 1 partners | 24 vehicles |
| Active from 1999/08/01 to 2002 | |
| Contact | |
| http://www.infati.dk | |
| Harry Lahrmann | |
| lahrmann@plan.aau.dk | |
| Aalborg University Denmark | |
| Catalogue entries | |
| Data catalogue | Tools catalogue |
| Data sets used in this FOT: No data set is |
The following tools were used in this FOT: No tool is linked |
The project has developed an OBU with an informative ISA-system (hardware and software). The system works in this way: a GPS-receiver establishes the position of the car one time each second. A map matching program locates the position on a digital road map which includes speed limits. A display shows the local speed limit, and the local speed limit is compared with the speed of the car. If the speed measured by the odometer exceeds the speed limit by more than 5 kph, the system responds by a friendly female voice which for example says “50, you are driving too fast”. At the same time the display flashes, and a red LED lights up. The voice is repeated every 6 seconds if the speed limit continues to be exceeded by more than 5 kph.
The system has been tested by 24 test drivers. The test shows larges variation in the effect on the drivers’ speed, most of them reduced their speed: some had large reductions; other had small reductions, while two slightly increased their speed. On average the test drivers reduced their speed violation from 9 - 13 km/h to 4-7 km/h, i.e. a speed reduction of 5 – 6 km/h. Only two test drivers which violated the speed limits on a regularly basis in the before period did not reduce their speed with ISA in the car, and one of these two drivers believe that he would reduce his speed by using the system for a longer period. The test-driving has also increased the test drivers’ awareness about the existing speed limits.
Details of Field Operational Test
Start date and duration of FOT execution
6 weeks with Start: 1 March 2001
Geographical Coverage
Municipality of Aalborg, 1200 km roads
Objectives
The project has two purposes:
A: to develop an On Board Unit (hardware and software) for a GPS-based ISA-system,
B: to have the On Board Unit (OBU) tested by test drivers in order to obtain user reactions to the system and to measure how the system influences the test drivers choice of speed.
Results
The 85% quantile for speed violations show a clear decline - in average 5 – 6 kph. At the same time, the analyses show a clearly larger decline in the speed violations in the rural areas than in the urban areas. However, the test drivers are still violating the speed limit, but the violations are reduced from 9 – 13 kph to 4 – 7 kph.
The experience of the test drivers is that the system is highly credible, i.e. the system rarely displays a wrong speed limit. Many of the test drivers are aware that the concept “freedom” in relation to speed is about the “freedom to break the law”, and the test drivers don’t feel that ISA has limited their freedom. However many of them feel annoyed when they are busy, and all type of test drivers have ignored the system in such situations. The majority of test drivers believe that lower speed generally doesn’t lead to a significant higher travel time. However in situations where they are busy, many of them respond by increasing speed.
Lessons learned
Main events
Financing
Summary, type of funding and budget
0.5 Mio EUR of public funding
Cooperation partners and contact persons
- Industry:
- Supplier: M-tec - http://www.m-tec.dk/en/welcome.htm
- Universities: Aalborg University
Main Contact person
Harry Lahrmann
Associate Professor and project manager in the FOT
Traffic Research Group
Department of Development and Planning
Aalborg University
Fibigerstraede 11
9220 Aalborg Oest
Denmark
Email: lahrmann@plan.aau.dk
Phone +45 9635 8381
Mobile: +45 4056 0375
Applications and equipment
Applications tested
Informative ISA
Vehicle
24 cars
Private cars with after market systems
Equipment carried by test users
Infrastructure
Test equipment
OBU for ISA
Methodology
Pre-simulation / Piloting of the FOT
Method for the baseline
Two weeks baseline – four weeks testdrive
Techniques for measurement and data collection
Collected data
0.5 million raw logged every second, storing on a flash memory
3 questionnaires with test drivers
1 focus group interview
In the project we have logged the participants driving every second and we collected 500,000 raw with log data. We are interested in corporation with other ISA research project in doing comparative studies.
Interested are welcome to contact us
Recruitment goals and methods
volunteer found by advertising in the local newspaper
Methods for the liaison with the drivers during the FOT execution
Hotline telephone
Methods for data analysis, evaluation, synthesis and conclusions
Logdata analysis in excel, Matlab and ArcGis
Questionnaires and focus group
