davis we ran into, part of jeff loux's sustainability course.from here that would actually be followed in the states? >> from my point of view, the technologies are all transferable. i think what's difficult for us to really get a grasp on, especially in the american west, is the density. >> reporter: of course, no one loves cars as much as americans do. but if this can happen in germany, the home of mercedes, and bmw, and the high-speed autobahn, maybe more americans can go two wheels. after all, we did. for "good morning america," jim sciutto, abc news, vauban, germany. >>> and coming up here on "good morning america," hot sauce. we taste tobasco straight from the source. all free clear's powerful clean is free of the ingredients you'll find in most detergents: no perfumes... no dyes... no preservatives... free clear is specially designed for people with sensitive skin and has powerful stainlifters, so you can trust it to get the job done right. free clear is the number-one detergent recommended by dermatologists... so, for a pure clean, all f