No, this is not the hot new tricycle on Park Slope playgrounds. It’s a high-tech electric bike ($5,000 at hammacherschlemmer.com) made for adults. Users sit upright with the handlebars at their sides and steer with their hips Segway style. Signaling, braking, and acceleration—it hits speeds of up to fourteen miles per hour—are controlled by buttons at your fingertips. The rechargeable battery lasts six miles, and once you’ve reached your destination, the 32-inch-tall, 25-pound two-wheeler folds into a neat little package. The morning commute never looked so fun.