Variable frame bike
Here’s an awesome bike concept: a variable frame that can be changed into different modes depending on your desire. For the city, you’ve got your normal upright position. It’s optimal for getting you from point A to point B as quickly as possible. In the case of traffic jams, you’ve got more control over the bike. But once you are out of the urban zone, adjust into the country mode and have a relaxing ride and enjoy the view.
The best part is that you may change positions without even getting off the bike. The rider is free to ride in either mode forever. But if there’s need to switch from one mode to another, they just lean backward or forward after pushing a locking lever.