*Article* **Integrated Design of a Custom Steering System in Cars and Verification of Its Correct Functioning**

**Włodzimierz Choroma ´nski, Iwona Grabarek \* and Maciej Kozłowski**

Faculty of Transport, Warsaw University of Technology, 75 Koszykowa Street, 00-662 Warsaw, Poland; wlodzimierz.choromanski@pw.edu.pl (W.C.); maciej.kozlowski@pw.edu.pl (M.K.)

**\*** Correspondence: iwona.grabarek@pw.edu.pl

**Abstract:** The subject of this article is the design of a nonstandard steering system in cars. The applied methodology takes into account universal design, ensuring the greatest possible adaptation of the steering system to potential users, and at the same time, thanks to the specific nature of the designed steering device, it also assumes a special approach allowing for individual adjustment of the steering system to the needs and limitations of drivers with lower-limb disabilities. It is implemented through the "custom design" methodology. This article presents the impact of the design features of the multifunction steering wheel on the correctness of driving, as well as the level of load on selected muscles of the upper limbs responsible for operating the steering wheel. The tests were carried out on a dynamic simulator of a motor vehicle using the electromyography (EMG) technique, which enables the measurement of muscle load. A systemic approach to training and verifying the skills of drivers using new HMI solutions is proposed.

**Keywords:** vehicle safety; driving simulator tests; steering system; EMG; universal design; custom design
