# Expandable City Cars Daniel Julier's 3Wheeler Has a Collapsible Rear Seat By Going Like Sixty | Published 2009-04-10 | Autos Source: Trend Hunter, https://www.trendhunter.com/trends/tiny-little-trikes-hydrogen-powered-car-has-fighter-plane-cockpit References: [ecofriend.org](http://www.ecofriend.org/entry/eco-cars-hydrogen-fueled-3wheeler-promises-a-green-ride/) & [coroflot](http://www.coroflot.com/public/individual_set.asp?c=1&set_id=261803&individual_id=237406) In the typical urban commute, it’s one person per car. Single-seater three-wheelers thereby dominate most city car designs. Daniel Julier's '3Wheeler' speaks to this [three-wheeled design](https://www.trendhunter.com/trends/kettwiesel-one-plus), but adapts it into a [1+1 concept](https://www.trendhunter.com/trends/scooter-platform), which means in a pinch you can jam another person in the rear, erm, rear seat. The single rear wheel opens up some room that can be used for a small storage space as well. The '3Wheeler' is meant to be powered by hydrogen, but it can also capture energy while going downhill to be used when going uphill for a boost. ## Trend Insights (Trend Hunter) - Score: 4.2/10 - Popularity: 22% | Activity: 96% | Freshness: 8% - Audience gender: 70% men, 30% women - Primary generations: Millennial - Top markets: North America, Europe ## Categories [Trend Hunter](https://www.trendhunter.com/trends) > [Autos](https://www.trendhunter.com/autos) ## Key Themes ### What's Driving This Trend - **Expandable City Cars:** Innovative designs that allow for additional passengers or storage space on a compact city car. - **Single-seater Alternatives:** Creative approaches to individual mobility, including single-seater vehicles optimized for urban travels. - **Hydrogen-powered Vehicles:** Innovations in hydrogen fuel cell technology that offer eco-friendly solutions for transportation. ### Who This Affects Most - **Automotive Industry:** Innovations in car manufacturing and design, with a focus on smaller, more efficient, and eco-friendly vehicles. - **Energy Industry:** Developments in hydrogen fuel cells and energy regeneration that could power the next generation of cars. - **Urban Planning and Transportation:** Creating sustainable and practical solutions for urban mobility, including shared transportation and alternative modes of transportation. ## Related on Trend Hunter - [Enclosed Electric Tricycles](https://www.trendhunter.com/trends/carver-electric-city-car.md) - [Hybrid Design Commuter Vehicles](https://www.trendhunter.com/trends/robotic-city-car.md) - [Expandable Electric Cargo Trikes](https://www.trendhunter.com/trends/electric-folding-cargo-bike.md) - [Single-Seater Bicycle Automobiles](https://www.trendhunter.com/trends/la-bagnole-electric-utv.md) - [Two-Wheeled EV Concepts](https://www.trendhunter.com/trends/twowheeled-electric-car.md) - [Customizable Electric Trikes](https://www.trendhunter.com/trends/maven-urban-etrike.md) - [Tadpole-Shaped Three-Wheelers](https://www.trendhunter.com/trends/threewheeled-cars.md) - [Three-Wheel Pod EVs](https://www.trendhunter.com/trends/the-nimbus-one.md) - [Rectangular Cockpit Scooters](https://www.trendhunter.com/trends/tricycle-scooter-design.md)