Futuristic Traffic Management
F Lai, O Carsten, University of Leeds, UK
This paper investigates the effect of Intelligent Speed Adaptation on drivers' speed limits compliance and its potential application in the context of traffic management.
Road safety is one of the primary objectives of traffic management. Within the context road safety, speeding and excessive speeds are a universal problem. The relationship between vehicle speed and accident occurrence and associated severity has been well documented. Of the three Es in road safety, enforcement and education approaches have their own merits but suffer from persistency. Engineering approaches such as road design are effective for spot speed reduction, but are less feasible for network treatment.
Another dimension of the engineering approaches is to focus on the vehicle. Intelligent Speed Adaptation (ISA) is an innovative driver support system which brings the speed limit into the vehicle. This paper provides insights into speed limit compliance in the presence of ISA systems based on results from two large-scale Field Operational Tests (FOT).
The ISA-UK field trials equipped 20 instrumented cars involved 80 participants. Each participant drove the ISA car for a 6-month period. ISA was turned off during the first month and the last month of the trial, and was turned on between the second month and the fifth month. This design allowed a baseline period and also examination of any carry-over effect after ISA being turned off. The trials took place in two geographic areas, Leeds, and Leicestershire. The ISA field trials collected 430,000 miles of driving data. The data was recorded at 10 Hz, resulting in 138 million records of driving data in the database. The ISA system developed in the ISA-UK project was linked to the vehicle's powertrain and was turned on upon engine ignition by default. Drivers would not be able to go over the prevailing speed limits unless they chose to override the ISA intervention.
In contrast to the intervening functionality, a follow-up ISA trial is currently running in Lancashire. The Lancashire ISA project deploys an advisory ISA system which involves an enhancement to standard satellite navigation systems to provide warnings when drivers are speeding. The trial consists of 2-month baseline, when the advisory ISA functionality was disabled, followed by a 6-month period when speed limits warning is provided. Driving data are logged at 1Hz. 430 voluntary drivers participate in this trial; the data collection phase is scheduled to be completed at the end of March 2011.
The effect of ISA on drivers' speed limit compliance will be compared with other types of speed reduction measures. Potential integration of ISA into traffic management systems. Since the ISA system makes use of digital road maps, this offers a network-wise solution for traffic management. Potential application of the ISA system will be discussed.
Association for European Transport