Journeys from home to the nearest bus stop, train station or news stand may well prove too far for walking, but not really far enough to justify the expense of getting in the car. For those in-between journeys, you need a lightweight personal transport solution. Maybe something like the Treadway Mobility which has been entered into this year's James Dyson Awards competition. Designed to strap over existing footwear or to step into, the wearable motorized shoes could just be geeky enough for tech fans and cool enough for thrill-seeking teenagers. But not just yet.