Manoeuvrability characteristics of cars operated by joysticks: a manoeuvring test

Download
Joakim Östlund

The aim of the report was to identify shortages and potential risks of vehicles operated by joysticks designed for drivers with severe disabilities, especially concerning the human-machine interaction.A small group of drivers with severe disabilities are able to drive a car provided it is fitted with a joystick for acceleration, braking and steering. Owing to the design of the joystick, which consists of an angle-operated lever fastened at one point, and the lack of natural feedback from the brake system and front (steering) wheels, the task of driving can be unnecessarily difficult and arduous. Above all, three risks can be identified: (1) The lack of feedback from steering causes the driver to make faster movements of the joystick than the servounit can manage, thus causing time delays in the steering system. (2) Since the joystick is angle-operated and the transfer function of the brake is not always optimal, it may be difficult to handle the brake in a controlled and comfortable way. (3) The most obvious risk is that the accelerator/brake control and the steering control may influence each other (interference), mainly since it is not possible to provide tactile separation of the control directions of the joystick.A manoeuvring test was carried out by five joystick drivers and a control group at Mantorp Park in the county of Östergötland. The possibilities of carrying out fast lateral manoeuvres and fixed controlled decelerations with the joystick were evaluated. Furthermore, a possible interference phenomenon was studied among joystick drivers. The results partly verified the identified risks, even so it was not possible to link the results to traffic safety consequences in an adequate way. Consequently, it is not known whether cars equipped with joysticks for severly disabled drivers create a risk from the traffic safety point of view.

LATEST NEWS


2018-06-13

International Conference on Electric Road Systems starts today

Electric Road Systems (ERS) is a relatively new concept with many initiatives on the way. To learn from each other and stimulate new collaborations the Swedish Research and Innovation Platform for Electric Roads arranged the first international conference...


2018-05-18

Same survey of road users’ attitudes in 50 countries

At the Road Safety on Five Continents Conference, RS5C, one entire session presented a large survey of road users' attitudes in 38 countries. Results show large differences between countries in many areas, both regarding behavior and attitudes. A new survey...


2018-05-17

Good results with alcohol interlock program according to Swedish study

An alcohol interlock program makes it possible for drink driving offenders to continue their everyday lives. In a Swedish study most of the participants were satisfied with the program and experienced improved health. They also reported drinking alcohol more...


2018-05-16

Traffic safety in the spotlight

Today the Conference Road Safety on Five Continents (RS5C) opened in Jeju Island, South Korea. More than 220 participators have come from all over the world to present findings and learn about traffic safety. Dr. Young Tae Kim, Secretary-General of the...


2018-04-17

VTI will develop simulators for ambulance staff

VTI has initiated a pilot study for paramedics with the Centre for Teaching & Research in Disaster Medicine and Traumatology and Linköping University. The aim is to give ambulance staff the opportunity to practice critical medical tasks in a moving vehicle in...


2018-04-12

Unique electrified road opens in Sweden

The world’s first electrified road recharging the batteries of cars and trucks while driving opened in Sweden. The Swedish Minister for Infrastructure, Tomas Eneroth, was at the formal inauguration of the electrified road on April 11, 2018. VTI is one of 22...