This graduation project, conducted in collaboration with Lynk & Co, delves into the examination of their current car-sharing service. Lynk & Co, an automotive brand featuring the 01 model, provides a comprehensive sharing platform allowing owners to share their vehicles, even with strangers. However, concerns arise when sharing with strangers regarding the ability to trust the borrower and their driving behaviour. Consequently, owners often reject booking requests from unfamiliar individuals, resulting in a low acceptance rate.

A thorough literature review and a questionnaire revealed five primary motivations for owners’ reluctance to engage in sharing: emotional attachment to the car, car availability, financial risks, trust in the user and system, and user behaviour. Furthermore, a journey map identified critical points in the car-sharing service, stimulating owners to offer their idle cars, providing a means to assess borrowers, and ensuring a sense of control during bookings. These insights collectively highlighted a predominant theme—the lack of control and trust in users.
However, amidst the identified challenges, an opportunity gap emerged: the car’s interior, a shared space between lender and borrower, with the potential to influence users through cognitive ergonomics. The proposed concept, named Stimulus, capitalizes on this opportunity by utilizing Lynk & Co’s distinctive car features and existing sensors to collect driving data. This data creates a profile of the borrower’s driving behaviour, addressing owners’ concerns about control during bookings.

The designed concept employs existing sensors to enhance the car-sharing experience by providing borrowers with real-time feedback on their driving style. This feedback is delivered through haptics in the steering wheel and visualizations on the car’s infotainment screens. Prototyping, both physical and digital, demonstrated the efficacy of this feedback system. Testing with 41 participants affirmed that haptic feedback effectively notifies users, and visualizations encourage careful driving. Moreover, borrowers expressed willingness to share this driving data, recognizing its benefits.
The culmination of driving behaviour data is made into a trip score. In addition to in-car modifications, the mobile app is redesigned to emphasize borrower trust. Parts that are added are a different review system, detailed user profiles and a market for placing requests. 

Stimulus addresses the challenges in Lynk & Co’s car-sharing service by leveraging cognitive ergonomics in the shared interior space, utilizing existing sensors for driving behaviour analysis and enhancing user trust through real-time feedback. The findings from the project present a holistic solution that contributes to more trust in and over borrowers, leading to a more beneficial car-sharing experience for the lender.